CN210751997U - Methane chloride drying device in glyphosate production tail gas - Google Patents
Methane chloride drying device in glyphosate production tail gas Download PDFInfo
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- CN210751997U CN210751997U CN201921571556.0U CN201921571556U CN210751997U CN 210751997 U CN210751997 U CN 210751997U CN 201921571556 U CN201921571556 U CN 201921571556U CN 210751997 U CN210751997 U CN 210751997U
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Abstract
The utility model discloses a methane chloride drying device in glyphosate production tail gas, including active alumina drying tower, molecular sieve drying tower, heater, condenser and condensate receiving tank, active alumina drying tower is the first order drying tower, and the molecular sieve drying tower is the second order drying tower, and the heater provides hot air for the regeneration of active alumina drying tower and molecular sieve drying tower, and the condenser is installed on the return circuit of regeneration gas, and the condensate receiving tank is installed in the below of condenser; the utility model adopts the active alumina drying tower as the primary drying to remove a large amount of water, methanol, methylal and other impurities, adopts the molecular sieve drying tower as the secondary drying, can still reach high adsorption efficiency under the condition of extremely little water, and has good drying effect; the drying tower is regenerated and the methanol and the methylal are recovered by adopting the heater and the condenser, so that the environmental pollution caused by the methanol and the methylal is reduced, and the recycling of the methanol and the methylal is facilitated.
Description
Technical Field
The utility model belongs to the technical field of chemical industry drying equipment, concretely relates to methane chloride drying device in glyphosate production tail gas.
Background
The alkyl ester method for producing glyphosate uses glycine, dimethyl phosphite and paraformaldehyde as raw materials, uses methanol as a solvent and triethylamine as a catalyst, glycine and polyformaldehyde form N, N-dihydroxyglycine under the action of the catalyst, dimethyl phosphite is added for condensation reaction, hydrochloric acid is added after the condensation reaction is carried out, the temperature is heated to about 115 ℃, and glyphosate and methylal are generated. From the analysis of the synthetic mechanism of glyphosate, a large amount of chloromethane is also produced as a byproduct in the hydrolysis process, and glyphosate and chloromethane are also produced by hydrolyzing synthetic intermediates, which is proved in production.
Through the intensive research on the synthetic mechanism and the production phenomenon of glyphosate, the hydrolysis process not only produces methylal, but also produces a large amount of methyl chloride. Because the CH3-O bond of the intermediate is more easily cleaved by hydrochloric acid than the CH3O-P bond, resulting in methyl chloride. In addition, excessive dimethyl phosphite can generate phosphorous acid and methyl chloride under the action of hydrochloric acid.
At present, the domestic chloromethane recovery method mainly comprises the following steps: the methyl chloride mixed gas is hydrolyzed, then the methyl chloride mixed gas is subjected to a condenser to recover methanol and methylal, the methylal and the methanol are washed away by water, and the methyl chloride mixed gas enters a gas cabinet after being washed by alkali. The gas discharged from the gas holder is indirectly cooled and then enters a sulfuric acid drying tower. The water washing tower, the alkaline washing tower and the sulfuric acid drying tower all adopt liquid recycling operation. And the chloromethane gas out of the drying tower enters a compressor after passing through a gas-liquid separator. The compressed chloromethane gas is converted into liquid chloromethane after being subjected to deep cooling. Although the drying effect of the currently adopted sulfuric acid drying can meet the requirement, the chloromethane gas contains a small amount of substances such as methanol, methylal, hydrogen chloride and the like, so that the dried dilute sulfuric acid has complex components, the COD content reaches more than 60 ten thousand mg/L, and the dilute sulfuric acid is extremely difficult to treat or purify and cannot be recycled and sold. Great difficulty is brought to follow-up; in order to solve the problems, it is necessary to develop a device for drying methane chloride in the tail gas of glyphosate production.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art and providing a methane chloride drying device in glyphosate production tail gas with good drying effect, low environmental pollution and benefit for recycling.
The purpose of the utility model is realized like this: the utility model provides a monochloromethane drying device in glyphosate production tail gas, receives the jar including active alumina drying tower, molecular sieve drying tower, heater, condenser and condensate, active alumina drying tower is one-level drying tower, the molecular sieve drying tower is second grade drying tower, active alumina drying tower with the molecular sieve drying tower series connection, the heater does active alumina drying tower with the regeneration of molecular sieve drying tower provides the hot air, the condenser is installed on regeneration gas's return circuit, the condensate receive the jar install in the below of condenser.
Preferably, the activated alumina drying towers are a two-tower combined device, and when one of the activated alumina drying towers performs the drying procedure, the other activated alumina drying tower performs the regeneration procedure.
Preferably, the molecular sieve drying tower is a double-tower combined device, and when one molecular sieve drying tower performs the drying procedure, the other molecular sieve drying tower performs the regeneration procedure.
Preferably, the heating source of the heater may be electricity, natural gas or steam.
Preferably, the air of the heater is condensed and recycled.
Owing to adopted above technical scheme, the beneficial effects of the utility model are that: the utility model adopts the active alumina drying tower as the primary drying, after removing a large amount of moisture, methanol, methylal and other impurities, adopts the molecular sieve drying tower as the secondary drying, still can reach very high adsorption efficiency under the condition of very little moisture, and the two are mutually matched, so that the impurities such as moisture, methanol, methylal, hydrogen chloride and the like contained in the chloromethane gas can be fully removed, and the drying effect is good; the utility model adopts the heater and the condenser to regenerate the drying tower and recover the methanol and the methylal, thereby reducing the environmental pollution caused by the methanol and the methylal and being beneficial to the recovery and the utilization of the methanol and the methylal; the active alumina drying tower and the molecular sieve drying tower of the utility model both adopt a double-tower combined mode, which is convenient for continuous drying and operation, is beneficial to the continuous use of the drying device and has high production efficiency; generally, the utility model has the advantages of drying effect is good, environmental pollution is low, do benefit to recycle.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. the device comprises an activated alumina drying tower 2, a molecular sieve drying tower 3, a heater 4, a condenser 5 and a condensate receiving tank.
Detailed Description
It is understood that the methyl chloride gas to be dried contains moisture, methanol, methylal and other impurities in addition to the main component of methyl chloride, wherein the methyl chloride exists in a gaseous state and the moisture, methanol, methylal and other impurities exist in a state of fine droplets.
The technical scheme of the utility model is further explained in detail with the attached drawings.
As shown in figure 1, the utility model provides a methane chloride drying device in glyphosate production tail gas, including activated alumina drying tower 1, molecular sieve drying tower 2, heater 3, condenser 4 and condensate receiving tank 5. The drying agents, namely the activated alumina and the molecular sieve in the activated alumina drying tower 1 and the molecular sieve drying tower 2 can sequentially absorb moisture, methanol, methylal and other impurities of the chloromethane gas to be dried, so that dry and pure chloromethane is obtained. Wherein, the heater 3 provides heat energy, and under the heating effect, the water, methanol, methylal and other impurities absorbed in the active alumina drying tower 1 and the molecular sieve drying tower 2 are converted into gas state, and then the gas enters the condenser to be condensed into liquid state, and then the liquid state is stored in the condensate receiving tank 5 to be recycled.
The active alumina drying tower 1 is a primary drying tower, the molecular sieve drying tower 2 is a secondary drying tower, the active alumina drying tower 1 and the molecular sieve drying tower 2 are connected in series, after the active alumina drying tower 1 for primary drying removes a large amount of moisture, methanol, methylal and other impurities from methyl chloride gas to be dried, the molecular sieve drying tower 2 for secondary drying can still achieve high adsorption efficiency under the condition of extremely little moisture, and the active alumina drying tower 1 and the molecular sieve drying tower are matched with each other, so that the moisture, the methanol, the methylal, hydrogen chloride and other impurities contained in the methyl chloride gas can be fully removed, and the drying effect is good.
The heater 3 provides the hot air for the regeneration of active alumina drying tower 1 and molecular sieve drying tower 2, condenser 4 is installed on the return circuit of regeneration gas for methanol and methylal in the recovery hot air, condensate receiving tank 5 is installed in the below of condenser, is used for receiving the methyl alcohol and methylal mixed liquid of retrieving, carries out the condensation recovery to methyl alcohol and methylal that take over in the regeneration hot gas, can reduce the consumption of methanol, can also increase the yield of methylal, and can avoid causing the pollution to the environment. Specifically, the temperature of hot air for heating and regenerating the activated alumina drying tower 1 and the molecular sieve drying tower 2 is controlled to be 180-200 ℃.
Specifically, the activated alumina drying towers 1 are double-tower combined devices, when one activated alumina drying tower 1 performs a drying procedure, the other activated alumina drying tower 1 performs a regeneration procedure, and after the regeneration procedure is completed, the drying capacity is recovered, and the two activated alumina drying towers 1 are alternately used, so that continuous drying and operation are facilitated, and continuous and stable operation of production is ensured.
Specifically, the molecular sieve drying towers 2 are a double-tower combined device, when one molecular sieve drying tower 2 performs a drying procedure, the other molecular sieve drying tower 2 performs a regeneration procedure, and after the regeneration procedure is completed, the drying capacity is recovered, and the two molecular sieve drying towers 2 are alternately used, so that continuous drying and operation are facilitated, and continuous and stable operation of production is ensured.
Specifically, the heating source of the heater 3 can be electricity, natural gas or steam, the air of the heater 3 is recycled after being condensed, and the heater 3 can be used for heating and regenerating activated alumina and a molecular sieve, so that the continuity and automation of drying can be ensured, and the service life can be prolonged.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A methane chloride drying device in tail gas of glyphosate production, which is characterized in that: the device comprises an activated alumina drying tower, a molecular sieve drying tower, a heater, a condenser and a condensate receiving tank, wherein the activated alumina drying tower is a primary drying tower, the molecular sieve drying tower is a secondary drying tower, the activated alumina drying tower and the molecular sieve drying tower are connected in series, the heater provides hot air for the activated alumina drying tower and the regeneration of the molecular sieve drying tower, the condenser is installed on a regeneration gas loop, and the condensate receiving tank is installed below the condenser.
2. The drying device for methane chloride in the tail gas generated in the glyphosate production according to claim 1, is characterized in that: the active alumina drying towers are double-tower combined devices, and when one active alumina drying tower carries out a drying procedure, the other active alumina drying tower carries out a regeneration procedure.
3. The drying device for methane chloride in the tail gas generated in the glyphosate production according to claim 1, is characterized in that: the molecular sieve drying tower is a double-tower combined device, and when one molecular sieve drying tower carries out a drying procedure, the other molecular sieve drying tower carries out a regeneration procedure.
4. The drying device for methane chloride in the tail gas generated in the glyphosate production according to claim 1, is characterized in that: the heating source of the heater may be electricity, natural gas or steam.
5. The drying device for methane chloride in the tail gas generated in the glyphosate production according to claim 1, is characterized in that: the air of the heater is recycled after being condensed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921571556.0U CN210751997U (en) | 2019-09-20 | 2019-09-20 | Methane chloride drying device in glyphosate production tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921571556.0U CN210751997U (en) | 2019-09-20 | 2019-09-20 | Methane chloride drying device in glyphosate production tail gas |
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| CN210751997U true CN210751997U (en) | 2020-06-16 |
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| CN201921571556.0U Active CN210751997U (en) | 2019-09-20 | 2019-09-20 | Methane chloride drying device in glyphosate production tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112263896A (en) * | 2020-09-23 | 2021-01-26 | 福建凯美特气体有限公司 | Carbon dioxide double-tower adsorption drying process |
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2019
- 2019-09-20 CN CN201921571556.0U patent/CN210751997U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112263896A (en) * | 2020-09-23 | 2021-01-26 | 福建凯美特气体有限公司 | Carbon dioxide double-tower adsorption drying process |
| CN112263896B (en) * | 2020-09-23 | 2022-06-24 | 福建凯美特气体有限公司 | Carbon dioxide double-tower adsorption drying process |
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