CN104445068A - Recovery method of by-product hydrogen in production process of metolachlor - Google Patents
Recovery method of by-product hydrogen in production process of metolachlor Download PDFInfo
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- CN104445068A CN104445068A CN201410673443.7A CN201410673443A CN104445068A CN 104445068 A CN104445068 A CN 104445068A CN 201410673443 A CN201410673443 A CN 201410673443A CN 104445068 A CN104445068 A CN 104445068A
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Abstract
The invention discloses a recovery method of by-product hydrogen in a production process of metolachlor. In the producing process of the metolachlor, a dehydrogenation process and a hydrogenation process are needed. The recovery method is characterized in that in the dehydrogenation process, propylene glycol monomethyl ether is treated through a dehydrogenation tower, a condenser and a gas-liquid separator so as to obtain the main product hydrogen and other impurities such as propylene glycol monomethyl ether, methoxy-2-propanone, methane, carbon dioxide, water and carbon monoxide; the obtained products are treated through a buffer tank a, a compressor, a bath tower, a freeze-drying tower, an adsorption tower and a buffer tank b so as to obtain high-purity hydrogen; then the obtained hydrogen is fed into a hydrogenation reaction kettle to be used in a hydrogenation process for producing the metolachlor. Through the method disclosed by the invention, the by-product hydrogen in the dehydrogenation process of the metolachlor is utilized and treated to be applied to the hydrogenation process, so that environmental pollution caused by the discharge of the hydrogen is reduced, and in addition, the cost of adding the hydrogen in the hydrogenation process is reduced.
Description
Technical field
The present invention relates to hydrogen recovery field, relate to the recovery method of by-product hydrogen in a kind of metolachlor production process in particular.
Background technology
In the production process of existing stage metolachlor, need through dehydrogenation and hydrogenation two-step process, the hydrogen produced in dehydration processes, often processes according to waste gas, enters in air, causes the pollution to environment; But need again to add hydrogen in hydrogenation process, turn increase the cost producing metolachlor.
Therefore how to provide a kind of method, in the production process of metolachlor, reduce hydrogen discharge reduction production cost is the problem that those skilled in the art need solution badly.
Summary of the invention
In view of this, the invention provides the recovery method of by-product hydrogen in a kind of metolachlor production process, the discharge that can reduce hydrogen also can reduce production cost to the pollution of environment.
For achieving the above object, the invention provides following technical scheme:
The recovery method of by-product hydrogen in a kind of metolachlor production process, produce metolachlor and need two-step process: dehydrogenating technology and hydrogenation technique, it is characterized in that, in dehydrogenating technology, propylene glycol monomethyl ether is through dehydrogenation tower, condenser and gas-liquid separator obtain mainly containing hydrogen, other impurity have propylene glycol monomethyl ether, methoxy acetone, methane, carbonic acid gas, water, carbon monoxide etc., the product obtained is through surge tank a, compressor, water wash column, lyophilize tower, adsorption tower, surge tank b obtains high-purity hydrogen, again the hydrogen obtained is passed in hydrogenation reaction kettle, hydrogenation process in producing for metolachlor.
Preferably, in above-mentioned a kind of metolachlor production process by-product hydrogen recovery method in, what adopt in described adsorption tower is the method for molecular sieve or molecular film.
Preferably, in above-mentioned a kind of metolachlor production process by-product hydrogen recovery method in, the treated hydrogen obtained can reach 0.8MPa.
The present invention is the by-product hydrogen utilized in the dehydrogenating technology of metolachlor, treatedly be passed in hydrogenation technique, the pollution of the environment that the discharge that this not only reduces hydrogen causes, reduces the cost of hydrogenation in hydrogenation technique simultaneously, has industrial value.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 accompanying drawing is the structural representation of present invention process flow process.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the invention discloses the pollution of the environment that a kind of discharge that not only can reduce hydrogen causes, also can be reduced in the method for the production metolachlor of the cost of hydrogenation in hydrogenation technique, specifically comprise:
Produce metolachlor and need two-step process: dehydrogenating technology and hydrogenation technique, it is characterized in that, in dehydrogenating technology, propylene glycol monomethyl ether obtains mainly containing hydrogen through dehydrogenation tower, condenser and gas-liquid separator, other impurity have propylene glycol monomethyl ether, methoxy acetone, methane, carbonic acid gas, water, carbon monoxide etc., the product obtained obtains high-purity hydrogen through surge tank a, compressor, water wash column, lyophilize tower, adsorption tower, surge tank b, again the hydrogen obtained is passed in hydrogenation reaction kettle, hydrogenation process in producing for metolachlor.
The present invention's utilization is the by-product hydrogen in the dehydrogenating technology of metolachlor, treatedly be passed in hydrogenation technique, the pollution of the environment that the discharge that this not only reduces hydrogen causes, reduces the cost of hydrogenation in hydrogenation technique simultaneously, has industrial value.
In order to optimize technique scheme further, what adopt in adsorption tower is the method for molecular sieve or molecular film, can meet the consumption of hydrogen in hydrogenation technique like this.
In order to optimize technique scheme further, the treated hydrogen obtained can reach 0.8MPa, can reach the quality standard of High Purity Hydrogen, meets the requirement of pressure and purity in hydrogenation technique.
In order to optimize technique scheme further, prepare example as following production method:
In hydrogenation reaction kettle, add thanomin 500kg, methoxy acetone 600kg, catalyzer 30kg, passes into recover hydrogen continuously, makes pressure remain on 0.5MPa, room temperature reaction 4h, transformation efficiency 99.1%.As added thanomin 500kg in hydrogenation reaction kettle, methoxy acetone 600kg, catalyzer 30kg, passes into raw hydrogen continuously, makes pressure remain on 0.5MPa, room temperature reaction 4h, and now transformation efficiency is 99.2%.Two kinds of method gained transformation efficiencys are approximate equivalent, and the method utilizing by-product hydrogen to be recycled decreases the cost adding raw hydrogen in hydrogenation technique, decreases the discharge in an atmosphere of by-product hydrogen equally.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (3)
1. the recovery method of by-product hydrogen in a metolachlor production process, produce metolachlor and need two-step process: dehydrogenating technology and hydrogenation technique, it is characterized in that, in dehydrogenating technology, propylene glycol monomethyl ether is through dehydrogenation tower, condenser and gas-liquid separator obtain mainly containing hydrogen, other impurity have propylene glycol monomethyl ether, methoxy acetone, methane, carbonic acid gas, water, carbon monoxide etc., the product obtained is through surge tank a, compressor, water wash column, lyophilize tower, adsorption tower, surge tank b obtains high-purity hydrogen, again the hydrogen obtained is passed in hydrogenation reaction kettle, hydrogenation process in producing for metolachlor.
2. the recovery method of by-product hydrogen in a kind of metolachlor production process according to claim 1, is characterized in that, what adopt in described adsorption tower is the method for molecular sieve or molecular film.
3. the recovery method of by-product hydrogen in a kind of metolachlor production process according to claim 1, it is characterized in that, the treated hydrogen obtained can reach 0.8MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410673443.7A CN104445068B (en) | 2014-11-21 | 2014-11-21 | The recovery method of by-product hydrogen in a kind of isopropyl methoxalamine production process |
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| CN201410673443.7A CN104445068B (en) | 2014-11-21 | 2014-11-21 | The recovery method of by-product hydrogen in a kind of isopropyl methoxalamine production process |
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| CN104445068A true CN104445068A (en) | 2015-03-25 |
| CN104445068B CN104445068B (en) | 2016-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280013A (en) * | 2017-07-19 | 2019-01-29 | 山东侨昌化学有限公司 | A method of automatically switching hydrogenation source |
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| FR2250734A1 (en) * | 1973-11-09 | 1975-06-06 | Inst Francais Du Petrole | Sec alcohol dehydrogenation to ketones - in liq. phase using metallic catalysts and organo reducing agents |
| US4200451A (en) * | 1972-06-06 | 1980-04-29 | Ciba-Geigy Corporation | Plant growth regulating agent |
| CS275182B2 (en) * | 1989-01-26 | 1992-02-19 | Univ Slovenska Tech | Method of 1-methoxy-2-propanone preparation |
| CN1093700A (en) * | 1992-12-29 | 1994-10-19 | 希巴-盖吉股份公司 | The preparation method of 2-alkyl-6-methyl-N-(1 ＇-methoxyl group-2 ＇-propyl group)-aniline and their N-chloroacetanilide |
| CN101121650A (en) * | 2007-09-13 | 2008-02-13 | 复旦大学 | A method for synthesizing methoxyacetone by gas-phase oxidative dehydrogenation of 1-methoxy-2-propanol |
| US20110054217A1 (en) * | 2008-04-17 | 2011-03-03 | United Phosphorus Limited | Hydrogenation of imines |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4200451A (en) * | 1972-06-06 | 1980-04-29 | Ciba-Geigy Corporation | Plant growth regulating agent |
| FR2250734A1 (en) * | 1973-11-09 | 1975-06-06 | Inst Francais Du Petrole | Sec alcohol dehydrogenation to ketones - in liq. phase using metallic catalysts and organo reducing agents |
| CS275182B2 (en) * | 1989-01-26 | 1992-02-19 | Univ Slovenska Tech | Method of 1-methoxy-2-propanone preparation |
| CN1093700A (en) * | 1992-12-29 | 1994-10-19 | 希巴-盖吉股份公司 | The preparation method of 2-alkyl-6-methyl-N-(1 ＇-methoxyl group-2 ＇-propyl group)-aniline and their N-chloroacetanilide |
| CN101121650A (en) * | 2007-09-13 | 2008-02-13 | 复旦大学 | A method for synthesizing methoxyacetone by gas-phase oxidative dehydrogenation of 1-methoxy-2-propanol |
| US20110054217A1 (en) * | 2008-04-17 | 2011-03-03 | United Phosphorus Limited | Hydrogenation of imines |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109280013A (en) * | 2017-07-19 | 2019-01-29 | 山东侨昌化学有限公司 | A method of automatically switching hydrogenation source |
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| CN104445068B (en) | 2016-09-28 |
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Effective date of registration: 20180103 Address after: 256600 Shandong province Binzhou City foreshore City Qin Yong Xin Road south southeast of Taiwan Patentee after: Shandong Qiao Chang Modern Agriculture Co., Ltd. Address before: 256600 Binzhou City, Shandong Province, the south side of xinyongxin Road, Binbei Office Patentee before: Qiaochang Chemical Co., Ltd., Shandong |
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