CN102001911A - Method for preparing 2,3,3,3-tetrafluoropropene - Google Patents
Method for preparing 2,3,3,3-tetrafluoropropene Download PDFInfo
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- CN102001911A CN102001911A CN2010102869653A CN201010286965A CN102001911A CN 102001911 A CN102001911 A CN 102001911A CN 2010102869653 A CN2010102869653 A CN 2010102869653A CN 201010286965 A CN201010286965 A CN 201010286965A CN 102001911 A CN102001911 A CN 102001911A
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- tetrafluoropropane
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- 238000000034 method Methods 0.000 title claims abstract description 11
- FXRLMCRCYDHQFW-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropene Chemical compound FC(=C)C(F)(F)F FXRLMCRCYDHQFW-UHFFFAOYSA-N 0.000 title abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 66
- SMCNZLDHTZESTK-UHFFFAOYSA-N 2-chloro-1,1,1,2-tetrafluoropropane Chemical compound CC(F)(Cl)C(F)(F)F SMCNZLDHTZESTK-UHFFFAOYSA-N 0.000 claims abstract description 26
- FDOPVENYMZRARC-UHFFFAOYSA-N 1,1,1,2,2-pentafluoropropane Chemical compound CC(F)(F)C(F)(F)F FDOPVENYMZRARC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims abstract description 20
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 238000004821 distillation Methods 0.000 claims abstract description 17
- OQISUJXQFPPARX-UHFFFAOYSA-N 2-chloro-3,3,3-trifluoroprop-1-ene Chemical compound FC(F)(F)C(Cl)=C OQISUJXQFPPARX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000003682 fluorination reaction Methods 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 14
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 14
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 13
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 10
- 241000282326 Felis catus Species 0.000 claims description 8
- UMGQVBVEWTXECF-UHFFFAOYSA-N 1,1,2,3-tetrachloroprop-1-ene Chemical group ClCC(Cl)=C(Cl)Cl UMGQVBVEWTXECF-UHFFFAOYSA-N 0.000 claims description 7
- FFTOUVYEKNGDCM-OWOJBTEDSA-N (e)-1,3,3-trifluoroprop-1-ene Chemical compound F\C=C\C(F)F FFTOUVYEKNGDCM-OWOJBTEDSA-N 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- UENGBOCGGKLVJJ-UHFFFAOYSA-N 2-chloro-1-(2,4-difluorophenyl)ethanone Chemical compound FC1=CC=C(C(=O)CCl)C(F)=C1 UENGBOCGGKLVJJ-UHFFFAOYSA-N 0.000 claims description 2
- FTCVHAQNWWBTIV-UHFFFAOYSA-N 1,1,1,2,2-pentachloropropane Chemical compound CC(Cl)(Cl)C(Cl)(Cl)Cl FTCVHAQNWWBTIV-UHFFFAOYSA-N 0.000 abstract 1
- 239000000047 product Substances 0.000 description 16
- 239000007789 gas Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 239000007795 chemical reaction product Substances 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- ZDCWZRQSHBQRGN-UHFFFAOYSA-N 1,1,1,2,3-pentafluoropropane Chemical compound FCC(F)C(F)(F)F ZDCWZRQSHBQRGN-UHFFFAOYSA-N 0.000 description 3
- CNNJBYUJTYGLGG-UHFFFAOYSA-N 2-chloro-1,1,1,3-tetrafluoropropane Chemical compound FCC(Cl)C(F)(F)F CNNJBYUJTYGLGG-UHFFFAOYSA-N 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000004587 chromatography analysis Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 2
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- AIYUHDOJVYHVIT-UHFFFAOYSA-M caesium chloride Chemical compound [Cl-].[Cs+] AIYUHDOJVYHVIT-UHFFFAOYSA-M 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 238000007033 dehydrochlorination reaction Methods 0.000 description 2
- 238000004334 fluoridation Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- ZYVSNYBYAYMMQV-UHFFFAOYSA-N 2-chloro-3-fluoroprop-1-ene Chemical compound FCC(Cl)=C ZYVSNYBYAYMMQV-UHFFFAOYSA-N 0.000 description 1
- QCMKXHXKNIOBBC-UHFFFAOYSA-N 3-fluoroprop-1-ene Chemical compound FCC=C QCMKXHXKNIOBBC-UHFFFAOYSA-N 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910021563 chromium fluoride Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 229910001293 incoloy Inorganic materials 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001635 magnesium fluoride Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- FTBATIJJKIIOTP-UHFFFAOYSA-K trifluorochromium Chemical compound F[Cr](F)F FTBATIJJKIIOTP-UHFFFAOYSA-K 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for preparing 2,3,3,3-tetrafluoropropene, comprising the following steps: a. in the presence of a fluorinated catalyst, hydrogen fluoride and 1,1,1,2,2-pentachloropropane or 2,3,3,3-tetrafluoropropene enter into a first reactor to react; b. in the presence of the fluorinated catalyst, 2-chloro-3,3,3 trifluoropropene, 2-chloro-1,1,1,2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and hydrogen fluoride enter into a second reactor to react; c. the product flow in the step a enters into a first distillation tower to be separated, the tower top components break away from the reaction system and the tower reactor components enter into a phase separator; d. the lower-layer components in the phase separator are recycled to the first reactor and the upper-layer light components in the phase separator and the product flow in the step b enter into a second distillation tower to be separated; e. the tower reactor components in the second distillation tower are recycled to the second reactor and the tower top components enter into a third distillation tower to be separated; and f. the tower reactor components on the third distillation tower are recycled to the second reactor and the tower top components break away from the reaction system.
Description
Technical field
The present invention relates to a kind of 2,3,3, the preparation method of 3-tetrafluoeopropene (HFO-1234yf), relate in particular to a kind of in the presence of fluorination catalyst, with hydrogen fluoride and 1,1,2,3-tetrachloro propylene (HCC-1230xf) is a raw material, obtains 2,3 through two step gas phase fluorination, 3, the preparation method of 3-tetrafluoeopropene.
Background technology
At present, 1,1,1,2-Tetrafluoroethane (HFC-134a) is widely used in the mobile air conditioner system as refrigeration agent, value (GWP) is 1430 because its Greenhouse effect are dived, and can cause global warming, needs the new needs of substitute to conform of exploitation.
2,3,3,3-tetrafluoeopropene, the ozone depletion value (ODP) of diving is zero, and GWP is 4, and atmospheric lifetime is 11 days only, has good physical and chemical performance, is considered to directly substitute the economical scheme of HFC-134a.U.S. Pat 2009024009 discloses the synthetic method of a kind of HFO-1234yf.This method is with 1,1,2, and 3-tetrachloro propylene is a raw material, at first at Cr
2O
3Under the existence of catalyzer, carry out HF gas phase fluorination 1,1,2 in first reactor, 3-tetrachloro propylene obtains 2-chloro-3,3, and 3-trifluoro propene (HCFC-1233xf) is then in second reactor, at SbCl
5Exist down, HF liquid-phase fluorination HCFC-1233xf obtains 2-chloro-1,1,1, and 2-tetrafluoropropane (HCFC-244bb) is at last in the 3rd reactor, at CsCl/MgF
2There is HCFC-244bb down,, obtains HFO-1234yf at 350~550 ℃ of dehydrochlorinations.But this method needs three-step reaction; And second the step be liquid-phase catalysis reaction, need isolation of intermediate products HCFC-244bb is as the raw material of three-step reaction.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes in the background technology, provides a kind of reactions steps less, need not the separation of intermediate product, and operational path is simple 2,3,3,3-tetrafluoeopropene preparation method.
The gas phase catalytic fluorination legal system is equipped with HFO-1234yf, and the principal reaction of generation is as follows:
CCl
2=CClCH
2Cl+3HF——→CF
3CCl=CH
2+3HCl (1)
CF
3CCl=CH
2+HF——→CF
3CFClCH
3 (2)
CF
3CFClCH
3——→CF
3CF=CH
2+HCl (3)
The main side reaction that takes place:
CF
3CFClCH
3+HF——→CF
3CF
2CH
3+HCl (4)
The present invention adopts two reactors, and first reactor mainly carries out HF and fluoridizes 1,1,2, the reaction of 3-tetrachloro propylene, and under proper reaction conditions, 1,1,2,3-tetrachloro propylene conversion can reach 100%, and primary product is HCFC-1233xf; Second reactor mainly carries out the reaction that HF fluoridizes HCFC-1233xf and the reaction of HCFC-244bb dehydrochlorination, (2) and (3) react, HCFC-244bb can take place simultaneously fluoridize generation 1,1,1,2, the side reaction (4) of 2-pentafluoropropane (HFC-245cb) and HFO-1234yf and HF addition generate the side reaction (5) of HFC-245cb.The present invention is circulated to second reactor with the HCl that reaction in second reactor generates with HFO-1234yf all the other products after separating, need not to carry out HCFC-244bb separates, and the HFC-245cb that returns is moved to the left reaction (3) balance, suppress HFO-1234yf and further fluoridized generation HFC-245cb, thereby improved the selectivity of HFO-1234yf.
In order to solve the problems of the technologies described above, of the present invention 2,3,3, the preparation method of 3-tetrafluoeopropene, with 1,1,2,3-tetrachloro propylene is a raw material, may further comprise the steps:
A. in the presence of fluorination catalyst, hydrogen fluoride and 1,1,2,3-tetrachloro propylene enters first reactor and reacts, and reaction conditions is: reaction pressure 0.1MPa~1.0MPa, HF and 1,1,2, the mol ratio 5~20 of 3-tetrachloro propylene, 2 seconds~30 seconds duration of contact, 220 ℃~350 ℃ of temperature of reaction comprise the 2-chloro-3 that reaction generates in the product that the obtains stream, 3,3-trifluoro propene, hydrogenchloride and unreacted hydrogen fluoride;
B. in the presence of fluorination catalyst, 2-chloro-3,3,3-trifluoro propene, 2-chloro-1,1,1, the 2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and HF enter second reactor and react, and reaction conditions is: reaction pressure 0.1MPa~1.0MPa, 5 seconds~30 seconds duration of contact, 280 ℃~380 ℃ of temperature of reaction, HF and 2-chloro-3,3,3 trifluoro propenes, 2-chloro-1,1,1,2-tetrafluoropropane and 1,1,1,2, the mol ratio 2~15 of 2-pentafluoropropane total amount, comprise 2 in the product stream that obtains, 3,3, the 3-tetrafluoeopropene, 1,1,1,2, the 2-pentafluoropropane, 2-chloro-1,1,1, the 2-tetrafluoropropane, 2-chloro-3,3, the 3-trifluoro propene, hydrogenchloride and unreacted hydrogen fluoride;
C. the product that obtains of step a, b flows to into first distillation tower and separates, and tower still component is a 2-chloro-3,3,3-trifluoro propene, 2-chloro-1,1,1,2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and hydrogen fluoride, the cat head component is hydrogenchloride and 2,3,3, the 3-tetrafluoeopropene, go out reactive system,, obtain target product 2 through deacidification, dehydration, rectifying, 3,3, the 3-tetrafluoeopropene;
D. the tower still component of step c distillation tower enters the second column separation, and tower still component is a 2-chloro-3,3,3-trifluoro propene and 2-chloro-1,1,1, and the 2-tetrafluoropropane is circulated to second reactor; The cat head component is HF and a small amount of 1,1,1,2, and the 2-pentafluoropropane is circulated to first reactor or/and second reactor.
The reaction conditions of the present invention's first reactor is preferably: reaction pressure 0.3MPa~0.6MPa, hydrogen fluoride and 1,1,2, the mol ratio 10~15 of 3-tetrachloro propylene; 5 seconds~10 seconds duration of contact; 260 ℃~300 ℃ of temperature of reaction; The reaction conditions of second reactor is preferably: reaction pressure 0.3MPa~0.6MPa; Hydrogen fluoride and 2-chloro-3,3,3-trifluoro propene, 2-chloro-1,1,1,2-tetrafluoropropane and 1,1,1,2, the mol ratio 4~8 of 2-pentafluoropropane total amount; 10 seconds~15 seconds duration of contact; 320 ℃~350 ℃ of temperature of reaction.
Among the present invention, the reacting product stream of first reactor and second reactor enters first distillation tower to be separated, and the cat head component is HCl and HFO-1234yf, and tower still component is HF, HCFC-1233xf, HCFC-244bb and HFC-245cb.The present invention can suitably select according to the working pressure of the level of equipment, general facilities, reactive system and the isolating composition of desire etc. to the operational condition of distillation tower without limits.Working pressure is 0.1MPa~1.0MPa, preferred 0.3MPa~0.6MPa.Generally speaking, for easy and simple to handle, the working pressure of distillation tower is consistent with reactive system.Tower top temperature and tower still temperature are by working pressure and material component decision thereof.
Among the present invention, fresh HF raw material can or enter reactive system by first reactor, second reactor simultaneously by any one reactor in first reactor, second reactor.
The present invention to the catalyzer in the fluoridation without limits, any known fluorination catalyst all is applicable to the present invention, for example: chromic oxide, chromium fluoride, fluorizated chromic oxide, aluminum fluoride, fluorizated aluminum oxide, be carried on chromic oxide on gac, aluminum fluoride, the magnesium fluoride, contain chromic oxide and the activated carbon supported SbCl of multiple metal (as Zn, Co, Ni, Ge, In etc.)
5Or TiCl
4Deng.The fluorination catalyst difference that adopts, reaction conditions difference then comprises the mol ratio of temperature of reaction, reaction pressure, duration of contact and material.The present invention preferably contains the chromium-based fluorination catalyst of Al, Zn, Mg, Ni metal powder, and the catalytic activity of this catalyzer is good, the selectivity height, and regenerability is good, and entire life is long.Chinese patent CN1651137A is seen in the preparation that contains the chromium-based catalysts of Al, Zn, Mg, Ni metal powder.
The type of reactor that the present invention is used for fluoridation is not crucial, any suitable gas phase fluorination device all is applicable to the present invention, and the present invention preferentially selects the material calandria type fixed bed reactor made of nickel and alloy (comprising Hastelloy, Inconel, Incoloy and Monel) thereof for example with anti-hydrogen fluoride corrosion effect for use.
Advantage of the present invention:
Of the present invention 2,3,3,3-tetrafluoeopropene preparation method is the gas phase catalytic fluorination successive reaction, has avoided second step liquid-phase fluorination process of prior art and the sepn process of intermediate product HCFC-244bb, operational path is simple, reactions steps is less, and reactions steps of the present invention was two steps, and the reactions steps of the method for documents was three steps.
Description of drawings
Fig. 1 represents 2,3,3, preparation technology's schema of 3-tetrafluoeopropene.
Label meaning in Fig. 1 is as follows.Pipeline: 1,2,4,6,7,9,10,11,12,13,14 and 16; First reactor: 3; First distillation tower: 5; Second column: 8; Second reactor: 15.
Embodiment
The present invention is described in more detail in conjunction with Fig. 1, but do not limit the present invention.
Fresh 1,1,2,3-tetrachloro propylene or 1,1,2, the mixture of 3-tetrachloro propylene and HF is through pipeline 1, enter in first reactor 3 that is filled with fluorination catalyst by pipeline 2 with the HF logistics that recycles through pipeline 11 and to react, the reactor outlet product pipeline 4 of flowing through is mixed into first distillation tower 5 with the second reactor outlet product stream that returns through pipeline 16 and separates.
First distillation tower, 5 cat head component HFO-1234yf and HCl enter the product after-treatment system by pipeline 6, obtain the HFO-1234yf product by deacidification, dehydration, rectifying; First distillation tower, 5 tower still components are HF, HCFC-1233xf, HCFC-244bb and HFC-245cb, enter second column 8 by pipeline 7 and separate.
Second column 8 cat head components are HF and small amount of H FC-245cb, and its part enters first reactor by pipeline 9,11 circulations, and its another part enters second reactor 15 by pipeline 9,12 circulations; Second column 8 tower still components are HCFC-1233xf, HCFC-244bb and HFC-245cb, mix mutually through pipeline 12 with second column 8 cat head component HF and small amount of H FC-245cb through pipeline 10, enter second reactor 15 by pipeline 14, under the effect of catalyzer, react; Reacting product stream mixes with first reactor reaction outlet product stream by pipeline 16, enters distillation tower 5 and separates.The fresh HF that adds enters first reactor and second reactor respectively through pipeline 1,13.
At internal diameter is to add 50 milliliters of chromium-based fluorination catalysts that contain Al, Zn, Mg, Ni in the carbon steel pipe of 38mm, and method for preparing catalyst is seen Chinese patent CN1651137A.First reactor is warming up to 260 ℃, feeds HF and 1,1,2,3-tetrachloro propylene reacts, control HF and 1,1,2, the mol ratio of 3-tetrachloro propylene is 10, be 5 seconds duration of contact, reaction pressure 0.1MPa, behind the reaction 20h, reaction product is after washing, alkali cleaning, alkali drying are removed HCl and HF, composition with the gas chromatographic analysis reaction product the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is to change the first reactor reaction temperature into 220 ℃, the results are shown in Table 1.
Embodiment 3
Operation substantially the same manner as Example 1, different is to change the first reactor reaction temperature into 300 ℃, the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is to change the first reactor reaction temperature into 350 ℃, the results are shown in Table 1.
Embodiment 5
Operation substantially the same manner as Example 1, different is changes material into 2 seconds the results are shown in Table 1 duration of contact.
Operation substantially the same manner as Example 1, different is will change 10 seconds duration of contact into to the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is will change 30 seconds duration of contact into to the results are shown in Table 1.
Embodiment 8
Operation substantially the same manner as Example 1, different is with HF and 1,1,2, the mol ratio of 3-tetrachloro propylene changes 5 into, the results are shown in Table 1.
Embodiment 9
Operation substantially the same manner as Example 1, different is with HF and 1,1,2, the mol ratio of 3-tetrachloro propylene changes 15 into, the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is with HF and 1,1,2, the mol ratio of 3-tetrachloro propylene changes 20 into, the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is to change reaction pressure into 0.3MPa, the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is to change reaction pressure into 0.6MPa, the results are shown in Table 1.
Operation substantially the same manner as Example 1, different is to change reaction pressure into 1.0MPa, the results are shown in Table 1.
Table 1
Other product comprises CF
3CFClCH
3(HCFC-244bb), CF
3CF
2CH
3(HFC-245cb) and the trace CF
3CHClCHF
2(HCFC-244db), CF
3CHFCH
2F (HFC-245eb) etc.
At internal diameter is to add 50 milliliters of chromium-based fluorination catalysts that contain Al, Zn, Mg, Ni in the carbon steel pipe of 38mm, method for preparing catalyst is seen Chinese patent CN1651137A, second reactor is warming up to 350 ℃, feeding HF and HCFC-1233xf reacts, the mol ratio of control HF and HCFC-1233xf is 4, be 10 seconds duration of contact, reaction pressure 0.1MPa, behind the reaction 20h, reaction product is after HCl and HF are removed in washing, alkali cleaning, with organic composition in the gas chromatographic analysis reaction product, the results are shown in Table 2.
Embodiment 15
Operation substantially the same manner as Example 14, different is changes the temperature of reaction of second reactor into 280 ℃, the results are shown in Table 2.
Operation substantially the same manner as Example 14, different is changes the temperature of reaction of second reactor into 320 ℃, the results are shown in Table 2.
Embodiment 17
Operation substantially the same manner as Example 14, different is changes the temperature of reaction of second reactor into 380 ℃, the results are shown in Table 2.
Embodiment 18
Operation substantially the same manner as Example 14, different is to change 5 seconds duration of contact into, the results are shown in Table 2.
Embodiment 19
Operation substantially the same manner as Example 14, different is to change 15 seconds duration of contact into, the results are shown in Table 2.
Embodiment 20
Operation substantially the same manner as Example 14, different is to change 30 seconds duration of contact into, the results are shown in Table 2.
Embodiment 21
Operation substantially the same manner as Example 14, different mol ratios with HF and HCFC-1233xf change 2 into and the results are shown in Table 2.
Embodiment 22
Operation substantially the same manner as Example 14, different mol ratios with HF and HCFC-1233xf change 8 into, the results are shown in Table 2.
Embodiment 23
Operation substantially the same manner as Example 14, different mol ratios with HF and HCFC-1233xf change 15 into, the results are shown in Table 2.
Embodiment 24
Operation substantially the same manner as Example 14, different change reaction pressure into 0.3MPa, the results are shown in Table 2.
Embodiment 25
Operation substantially the same manner as Example 14, different change reaction pressure into 0.6MPa, the results are shown in Table 2.
Embodiment 26
Operation substantially the same manner as Example 14, different change reaction pressure into 1.0MPa, the results are shown in Table 2.
Table 2
Other product comprises CF
3CFClCH
3(HCFC-244bb), CF
3CF
2CH
3(HFC-245cb) and the trace CF
3CHClCHF
2(HCFC-244db), CF
3CHFCH
2F (HFC-245eb) etc.
Embodiment 27
At internal diameter is to add 50 milliliters in the carbon steel pipe of 38mm to contain Al, Zn, Mg, the chromium-based fluorination catalyst of Ni, method for preparing catalyst is seen Chinese patent CN1651137A, be warming up to 350 ℃, feed HCFC-1233xf, HCFC-244bb, HFC-245cb and HF react, control HFC-245cb, the molar ratio of HCFC-244bb and HCFC-1233xf 0.1: 0.2: 1, HF and mol ratio (HCFC-1233xf+HCFC-244bb+HFC-245cb) are 4, be 10 seconds duration of contact, reaction pressure 0.1MPa, behind the reaction 20h, reaction product is through washing, after HCl and HF are removed in alkali cleaning,, the results are shown in Table 3 with organic composition in the gas chromatographic analysis reaction product.
Embodiment 28
Operation substantially the same manner as Example 27, different molar ratios with HFC-245cb, HCFC-244bb and HCFC-1233xf change 0.2: 0.5: 1 into, the results are shown in Table 3.
Embodiment 29
Operation substantially the same manner as Example 27, different molar ratios with HFC-245cb, HCFC-244bb and HCFC-1233xf change 0.5: 0.1: 1 into, the results are shown in Table 3.
Embodiment 30
Operation substantially the same manner as Example 27, different molar ratios with HFC-245cb, HCFC-244bb and HCFC-1233xf change 0.5: 0.5: 1 into, the results are shown in Table 3.
Table 3
Other product comprises CF
3CFClCH
3(HCFC-244bb), CF
3CF
2CH
3(HFC-245cb) and the trace CF
3CHClCHF
2(HCFC-244db), CF
3CHFCH
2F (HFC-245eb) etc.
Claims (2)
1. one kind 2,3,3, the preparation method of 3-tetrafluoeopropene, this method are with 1,1,2, and 3-tetrachloro propylene is a raw material, may further comprise the steps:
A. in the presence of fluorination catalyst, hydrogen fluoride and 1,1,2,3-tetrachloro propylene enters first reactor and reacts, and reaction conditions is: reaction pressure 0.1MPa~1.0MPa, hydrogen fluoride and 1,1,2, the mol ratio 5~20 of 3-tetrachloro propylene, 2 seconds~30 seconds duration of contact, 220 ℃~350 ℃ of temperature of reaction comprise the 2-chloro-3 that reaction generates in the product that the obtains stream, 3,3-trifluoro propene, hydrogenchloride and unreacted hydrogen fluoride;
B. in the presence of fluorination catalyst, 2-chloro-3,3, the 3-trifluoro propene, 2-chloro-1,1,1, the 2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and hydrogen fluoride enter second reactor and react, and reaction conditions is: reaction pressure 0.1MPa~1.0MPa, 5 seconds~30 seconds duration of contact, 280 ℃~380 ℃ of temperature of reaction, hydrogen fluoride and 2-chloro-3,3,3 trifluoro propenes, 2-chloro-1,1,1,2-tetrafluoropropane and 1,1,1,2, the mol ratio 2~15 of 2-pentafluoropropane total amount, comprise 2,3 in the product stream that obtains, 3, the 3-tetrafluoeopropene, 1,1,1,2, the 2-pentafluoropropane, 2-chloro-1,1,1, the 2-tetrafluoropropane, 2-chloro-3,3, the 3-trifluoro propene, hydrogenchloride and unreacted hydrogen fluoride;
C. the product that obtains of step a, b flows to into first distillation tower and separates, and tower still component is a 2-chloro-3,3,3-trifluoro propene, 2-chloro-1,1,1,2-tetrafluoropropane, 1,1,1,2,2-pentafluoropropane and hydrogen fluoride, the cat head component is hydrogenchloride and 2,3,3, the 3-tetrafluoeopropene, go out reactive system,, obtain target product 2 through deacidification, dehydration, rectifying, 3,3, the 3-tetrafluoeopropene;
D. the tower still component of step c distillation tower enters the second column separation, and tower still component is a 2-chloro-3,3,3-trifluoro propene and 2-chloro-1,1,1, and the 2-tetrafluoropropane is circulated to second reactor; The cat head component is a hydrogen fluoride and a small amount of 1,1,1,2, and the 2-pentafluoropropane is circulated to first reactor or/and second reactor.
2. according to claim 12,3,3, the preparation method of 3-tetrafluoeopropene is characterized in that the reaction conditions of first reactor described in the step a is: reaction pressure 0.3MPa~0.6MPa, hydrogen fluoride and 1,1,2, the mol ratio 10~15 of 3-tetrachloro propylene; 5 seconds~10 seconds duration of contact; 260 ℃~300 ℃ of temperature of reaction; The reaction conditions of second reactor described in the step b is: reaction pressure 0.3MPa~0.6MPa; Hydrogen fluoride and 2-chloro-3,3,3-trifluoro propene, 2-chloro-1,1,1,2-tetrafluoropropane and 1,1,1,2, the mol ratio 4~8 of 2-pentafluoropropane total amount; 10 seconds~15 seconds duration of contact; 320 ℃~350 ℃ of temperature of reaction.
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