CN102701952A - Method for preparing retarded sodium gluconate - Google Patents
Method for preparing retarded sodium gluconate Download PDFInfo
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- CN102701952A CN102701952A CN2012101938829A CN201210193882A CN102701952A CN 102701952 A CN102701952 A CN 102701952A CN 2012101938829 A CN2012101938829 A CN 2012101938829A CN 201210193882 A CN201210193882 A CN 201210193882A CN 102701952 A CN102701952 A CN 102701952A
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- Prior art keywords
- sodium gluconate
- setting type
- type preparation
- retardation setting
- reaction
- Prior art date
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- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000000176 sodium gluconate Substances 0.000 title claims abstract description 25
- 235000012207 sodium gluconate Nutrition 0.000 title claims abstract description 25
- 229940005574 sodium gluconate Drugs 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title abstract description 9
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims abstract description 28
- 239000008103 glucose Substances 0.000 claims abstract description 28
- 238000002360 preparation method Methods 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000000376 reactant Substances 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 230000035484 reaction time Effects 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims abstract description 5
- 229910052797 bismuth Inorganic materials 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 13
- 229910052763 palladium Inorganic materials 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 239000004480 active ingredient Substances 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000003054 catalyst Substances 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract 2
- 239000012670 alkaline solution Substances 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 22
- 238000007664 blowing Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000000855 fermentation Methods 0.000 description 3
- 230000004151 fermentation Effects 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for preparing retarded sodium gluconate. The method comprises the following steps of: performing a contact reaction on a glucose solution and an oxygen-containing gas in an alkaline solution in which a Pd-Bi catalyst taking active carbon as a carrier suspends to generate sodium gluconate; and when the residual sugar content of a reactant is less than or equal to 2 percent, ending the reaction, and filtering the catalyst and other impurities out of the material by adopting a bag-type filter under a negative-pressure condition to obtain a sodium gluconate solution of which the concentration is 0.01M-2M. The preparation method has the advantages of short reaction time, high production efficiency, low production cost and stability and recyclability of the catalyst.
Description
Technical field
The present invention relates to a kind of retardation setting type Preparation of Sodium Gluconate.
Background technology
Sunmorl N 60S is widely used in the concrete aspect as retardant.Sunmorl N 60S can increase concrete plasticity-and intensity as hydroxycarboxylic acid retardant and the compound use of high efficiency water reducing agent, and retardation (promptly postponing concrete initial and final setting time) is arranged.C is depended in condensing of cement
3A and the formed network structure of gypsum hydration afterreaction thing overlap joint intersected with each other.At the aquation initial stage, because Sunmorl N 60S has reduced solution surface tension, solution strengthens the particulate wetting ability, and particulate aquation point alive increases, and has promoted C
3The dissolving of A, Sunmorl N 60S and Ca simultaneously
2+Complexing, make Ca in the solution
2+Concentration reduces, and quickens gypsum dissolution and separates out SO
4 2-, promoted the formation of AFt; Because the crane span structure effect of AFt (ettringite) promotes that slurry condenses; Sunmorl N 60S is adsorbed in particle surface on the other hand, has suppressed C
3A, C
3The growth of the aquation of S, newborn crystalline phase, simultaneously strong adsorption has formed the surface hydration barrier film, makes that point of contact tails off between particle, has weakened intergranular bridging, thereby has prolonged time of coagulation.
In the prior art, the main method of producing Sunmorl N 60S has: biological fermentation process, electrolytic oxidation, homogeneous chemistry oxidation style and heterogeneous catalytic oxidation method.Be main with biological fermentation process and heterogeneous catalytic oxidation method wherein, but adopt the Sunmorl N 60S purity of biological fermentation process preparation not high, impurity is many; The problem that adopts the heterogeneous catalytic oxidation method to exist is a long reaction time, and cost is high and the catalyzer bullion content is high and easy inactivation.
Summary of the invention
The object of the present invention is to provide the retardation setting type Preparation of Sodium Gluconate that a kind of reaction times is short, production efficiency is high, production cost low and catalyzer is stablized and can be recycled.
For reaching above-mentioned purpose, solution of the present invention is:
A kind of retardation setting type Preparation of Sodium Gluconate may further comprise the steps: glucose solution generates Sunmorl N 60S with the oxygen-containing gas contact reacts in being suspended with the basic soln of Pd-Bi catalyzer that activated carbon is a carrier; When residual sugar content is less than or equal to 2% in the reactant, finish reaction, adopt deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen, obtain the sodium gluconate solution that concentration is 0.01M-2M.
Further, basic soln is the Pottasium Hydroxide or the sodium hydroxide of ionic membrane, perhaps is similar basic soln.
Further, glucose solution concentration is 0.01M-2M (mol/L), and this concentration helps raising the efficiency, if concentration is lower than this concentration, then influences speed of reaction, if concentration is higher than this concentration, then contacts insufficiently with oxygen, and speed of reaction is low.
Further, catalyzer is 0.005-0.02:1 with the glucose quality ratio, and the mass ratio in this scope helps improving the transformation efficiency of glucose, raises the efficiency, and practices thrift cost.
Further, the pH value of basic soln is 8-9, and the pH value in this scope makes the transformation efficiency of reaction reach best.
Further, oxygen-containing gas is an air, glucose solution is sprayed contact with air, and projection velocity is 100-2000 mlmin
-1, in this projection velocity scope, the better effects if that contacts of glucose solution and oxygen.
Further, the temperature of reaction of glucose selective oxidation reaction is 35 ℃-80 ℃, and this range of reaction temperature helps improving transformation efficiency.
Further, the reaction times is 0.5h-20h, in this reaction time range, can reach preferable transformation efficiency, can improve reaction efficiency.
Further, reaction pressure is 1-4Mpa, under this reaction pressure, can reach preferable transformation efficiency.
Further, catalyzer is carrier with the gac, and mass percent is that the Pd of 0.1-10% is as active ingredient; Mass percent is that 0.01-5%Bi is as promotor; And the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process, and in this scope, catalyst activity is preferable.
After adopting such scheme; The present invention utilizes gac (C) to be the gating catalytic oxidation effect to glucose of the palladium metal of load (Pd) and bismuth (Bi) catalyzer (Pd-Bi/C catalyzer); Glucose is being converted into glucono-, is adopting basic soln neutralization then and obtain Sunmorl N 60S.
The oxidation of glucose under the Pd-Bi/C catalyst action carried out according to oxydehydrogenation mechanism, and wherein bismuth is as promotor, and its effect is a deep oxidation of avoiding the palladium surface; Next is that bismuth has suppressed the irreversible adsorption of reactant on palladium; Thereby make Pd-Bi/ C have high reactivity, thus improved speed of reaction, prolonged the work-ing life of catalyzer; Increased the cycle index of catalyzer, the use cost of the catalyzer of reduction; And under certain pressure, adopted solution to spray the method that contacts with air, increased effective contact area of gas-solid-liquid; Improved the transformation efficiency of Sunmorl N 60S; Thereby improved production efficiency, shortened the reaction times, reduced production cost greatly.
Embodiment
Below in conjunction with specific embodiment the present invention is done detailed explanation.
Embodiment 1
The glucose material of 300Kg is put in the stills for air blowing, added the deionized water (forming concentration is the glucose solution of 0.93M) of 1500Kg and the Pd-Bi/C catalyzer of 1.5Kg simultaneously, catalyzer is carrier with the gac; 5% Pd is as active ingredient; 0.1%Bi is as promotor, and the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process, and adding the sodium hydroxide of ionic membrane and keeping the pH value is 8; Spray glucose solution and contact with air with making it, projection velocity is 400mlmin
-1Heating simultaneously makes temperature rise to 35 ℃; The pressure of keeping stills for air blowing is 2MPa, and behind the oxidizing reaction 6h, the residual sugar content in reactant is less than or equal to 2% (adopting the method for strongly acidic cationic exchange resin to measure); Reaction finishes; Adopt deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen (this impurity is solid insoluble, and residual sugar is retained in the solution), promptly obtain the sodium gluconate solution that concentration is 0.93M (concentration of the liquid caustic soda of concentration and the interpolation of this concentration through the glucose solution of original preparation comprehensively obtains).
Embodiment 2
The glucose material of 450Kg is put in the stills for air blowing, added the deionized water (forming concentration is the glucose solution of 1.28M) of 1500Kg and the Pd-Bi/C catalyzer of 4.5Kg simultaneously, catalyzer is carrier with the gac; 9% Pd is as active ingredient; 0.4%Bi is as promotor, and the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process, and adding the Pottasium Hydroxide of ionic membrane and keeping the pH value is 9; Spray glucose solution and contact with air with making it, projection velocity is 700 mlmin
-1Heating simultaneously makes temperature rise to 60 ℃, and the pressure of keeping stills for air blowing is 3MPa, behind the oxidizing reaction 4h; Residual sugar content in reactant is less than or equal to 2%; Reaction finishes, and adopts deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen, and promptly obtaining concentration is the 1.28M sodium gluconate solution.
Embodiment 3
The glucose material of 600Kg is put in the stills for air blowing, added the deionized water (forming concentration is the glucose solution of 1.59M) of 1500Kg and the Pd-Bi/C catalyzer of 12Kg simultaneously, catalyzer is carrier with the gac; 6% Pd is as active ingredient; 1%Bi is as promotor, and the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process, and adding the sodium hydroxid of ionic membrane and keeping the pH value is 8; Spray glucose solution and contact with air with making it, projection velocity is 800mlmin
-1Heating simultaneously makes temperature rise to 50 ℃, and the pressure of keeping stills for air blowing is 4MPa, behind the oxidizing reaction 2h; Residual sugar content in reactant is less than or equal to 2%; Reaction finishes, and adopts deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen, and promptly obtaining concentration is the 1.59M sodium gluconate solution.
Embodiment 4
The glucose material of 750Kg is put in the stills for air blowing, added the deionized water (forming concentration is the glucose solution of 1.85M) of 1500Kg and the Pd-Bi/C catalyzer of 11Kg simultaneously, catalyzer is carrier with the gac; 10% Pd is as active ingredient; 1%Bi is as promotor, and the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process, and adding the Pottasium Hydroxide of ionic membrane and keeping the pH value is 9; Spray glucose solution and contact with air with making it, projection velocity is 1000 mlmin
-1Heating simultaneously makes temperature rise to 80 ℃, and the pressure of keeping stills for air blowing is 1MPa, behind the oxidizing reaction 3h; Residual sugar content in reactant is less than or equal to 2%; Reaction finishes, and adopts deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen, and can obtain concentration is the 1.85M sodium gluconate solution.
Sodium gluconate solution with embodiment 1-4 preparation; Adopt standard cement; The concrete admixture of admixture 0.2%; And the volume of Sunmorl N 60S is 0.1% of the solid volume of admixture folding, according to GB 8076-2008 " concrete admixture ", surveys its concrete coagulating time, dispersiveness and dispersed hold facility.Concrete mix is: cement 360kg/m
3, sand 803kg/m
3, stone 982 kg/m
3, the slump is controlled at 210 ± 10mm, and the gained result is as shown in table 1.
Sample | Benchmark | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
Water consumption/kg | 4020 | 2300 | 2223 | 2400 | 2308 |
Time of coagulation/h | 8 | 12 | 13 | 12.5 | 13 |
Slump T 0 | 205 | 205 | 215 | 210 | 210 |
Through the time slump T 1h | 150 | 190 | 205 | 195 | 200 |
Can find out through the experiment test result, adopt the prepared retardation setting type Sunmorl N 60S of the present invention to prolong the slow setting time preferably, significantly reduce slump-loss, play slow setting and protected the effect of collapsing.
The above is merely preferred embodiment of the present invention, is not the restriction to this case design, and all equivalent variations of doing according to the design key of this case all fall into the protection domain of this case.
Claims (10)
1. retardation setting type Preparation of Sodium Gluconate is characterized in that: may further comprise the steps: glucose solution generates Sunmorl N 60S with the oxygen-containing gas contact reacts in being suspended with the basic soln of Pd-Bi catalyzer that activated carbon is a carrier; When residual sugar content is less than or equal to 2% in the reactant, finish reaction, adopt deep bed filter under condition of negative pressure, the catalyzer in the material and other contaminant filters to be fallen, obtain the sodium gluconate solution that concentration is 0.01M-2M.
2. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: basic soln is the Pottasium Hydroxide or the sodium hydroxide of ionic membrane.
3. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: glucose solution concentration is 0.01M-2M.
4. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: catalyzer is 0.005-0.02:1 with the glucose quality ratio.
5. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: the pH value of basic soln is 8-9.
6. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: oxygen-containing gas is an air, solution is sprayed contact with air, and projection velocity is 100-2000mlmin
-1
7. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: the temperature of reaction of glucose selective oxidation reaction is 35 ℃-80 ℃.
8. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: the reaction times is 0.5h-20h.
9. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1 is characterized in that: reaction pressure is 1-4MPa.
10. a kind of retardation setting type Preparation of Sodium Gluconate as claimed in claim 1; It is characterized in that: catalyzer is carrier with the gac; Mass percent is that the Pd of 0.1-10% is as active ingredient; Mass percent be 0.01-5%Bi as promotor, and the load of Pd and Bi is Pd behind the first Bi in proper order in the preparation process.
Priority Applications (1)
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CN2012101938829A CN102701952A (en) | 2012-06-13 | 2012-06-13 | Method for preparing retarded sodium gluconate |
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CN2012101938829A CN102701952A (en) | 2012-06-13 | 2012-06-13 | Method for preparing retarded sodium gluconate |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108079987A (en) * | 2018-01-29 | 2018-05-29 | 云南森博混凝土外加剂有限公司 | A kind of preparation method for the catalyst for being used to prepare sodium gluconate |
CN108262040A (en) * | 2018-01-29 | 2018-07-10 | 云南森博混凝土外加剂有限公司 | A kind of catalyst for being used to prepare sodium gluconate |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN87100011A (en) * | 1987-01-05 | 1988-07-27 | 中国石化总公司浙江镇海石化总厂 | The manufacture method of Sunmorl N 60S |
CN1153166A (en) * | 1996-07-09 | 1997-07-02 | 桐乡市天融食品添加剂有限责任公司 | Method for preparing gluconate in presence of Bi-Pd/C metal catalyst |
CN101844082A (en) * | 2009-03-25 | 2010-09-29 | 阳新县科生化工有限公司 | Method for regenerating inactivated palladium-bismuth-carbon catalyst in catalytic oxidation of glucose |
-
2012
- 2012-06-13 CN CN2012101938829A patent/CN102701952A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN87100011A (en) * | 1987-01-05 | 1988-07-27 | 中国石化总公司浙江镇海石化总厂 | The manufacture method of Sunmorl N 60S |
CN1153166A (en) * | 1996-07-09 | 1997-07-02 | 桐乡市天融食品添加剂有限责任公司 | Method for preparing gluconate in presence of Bi-Pd/C metal catalyst |
CN101844082A (en) * | 2009-03-25 | 2010-09-29 | 阳新县科生化工有限公司 | Method for regenerating inactivated palladium-bismuth-carbon catalyst in catalytic oxidation of glucose |
Non-Patent Citations (1)
Title |
---|
柯余良等: "葡萄糖酸钠的生产工艺研究及其应用", 《混凝土外加剂生产技术和应用新进展学术交流会议论文集》, 14 April 2012 (2012-04-14), pages 167 - 171 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108079987A (en) * | 2018-01-29 | 2018-05-29 | 云南森博混凝土外加剂有限公司 | A kind of preparation method for the catalyst for being used to prepare sodium gluconate |
CN108262040A (en) * | 2018-01-29 | 2018-07-10 | 云南森博混凝土外加剂有限公司 | A kind of catalyst for being used to prepare sodium gluconate |
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Application publication date: 20121003 |