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System and method for treating waste gas during synthesis of dimethyl sulfate

A technology for dimethyl sulfate and waste gas treatment, which is applied in gas treatment, combustion methods, separation methods, etc., can solve the problems of waste gas without reasonable and suitable treatment methods, corroded equipment and pipelines, and a large amount of waste lye, etc., and achieve economic benefits And environmental protection benefits are obvious, the equipment has no corrosion, no secondary pollution effect

Pending Publication Date: 2019-11-15
BEIJING CHEM REACTION ENG SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This water-containing acidic mixed gas has the problem of corroding equipment and pipelines. If it is not handled properly, it will cause environmental pollution when it is discharged into the atmosphere.
[0004] At present, the treatment method for this kind of waste gas is mainly carried out by the method of alkali solution absorption, that is, alkali washing, but the treatment process produces a large amount of waste lye, and the waste lye contains a certain amount of salt
It is difficult to deal with these salty waste lye
In addition, in addition to inorganic acid gases, this part of waste gas also contains a certain amount of organic waste gas, which is complex and difficult to deal with.
Therefore, there is no reasonable and suitable treatment method for the treatment of waste gas in the synthesis of dimethyl sulfate.

Method used

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  • System and method for treating waste gas during synthesis of dimethyl sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A waste gas treatment system in the synthesis of dimethyl sulfate, which includes a gas-liquid phase separation tank 1, an induced draft fan 2, a first-level absorption tower 3, a second-level absorption tower 4, a second-level absorption tower 5, a first Heater 6, the second heat exchanger 7, the 3rd heat exchanger 8, acid gas concentration detector 9 and VOCs catalytic combustion system; Described gas-liquid phase separation tank 1 is used for producing in the synthesis of dimethyl sulfate containing The waste gas of water is separated into gas phase and liquid phase; after the first-level absorption tower 3 and the second-level absorption tower 4 are connected in parallel, the top of the gas-liquid phase separation tank 1 is connected through the induced draft fan 2, for separating the gas-liquid phase The gas separated in the tank 1 is transported from the top of the gas-liquid phase separation tank 1 through the induced draft fan 2 to carry out the adsorption treatm...

Embodiment 2

[0036] A kind of preparation of macroporous weakly basic anion exchange resin comprises the following steps:

[0037] S11: Preparation of polymerized white balls, the initiator azobisisobutyronitrile (AIBN), monomer styrene, crosslinking agent divinylbenzene, porogen n-butanol, and dispersant polyvinyl alcohol are formed by liquid phase suspension polymerization Polymerized white balls with a particle size distribution of 1 to 4 mm, in which the concentration of the dispersant is 0.01 to 0.1 wt %; the mass ratio of the crosslinking agent to the monomer is 1:3 to 8; the polymerization is carried out in stages: firstly, the temperature is raised from room temperature to 75°C, suspend polymerization at 75°C for 2 hours, then raise the temperature to 90°C, and polymerize at 90°C for 2 hours;

[0038] S12: Chloromethylation reaction, the alkylation reagent chloromethyl ether and the above-mentioned polymerized white balls are mixed according to the mass ratio of 3-5:1, reacted at 3...

Embodiment 3

[0042] A kind of processing method of waste gas in the synthesis of dimethyl sulfate, it uses the waste gas treatment system in the synthesis of dimethyl sulfate of embodiment 1, and the macroporous weakly basic anion exchange resin prepared by embodiment 2 is loaded on the first stage In absorption tower 3, second one level absorption tower 4 and secondary absorption tower 5, comprise the following steps:

[0043] S1. The waste gas from the production workshop is sent to the gas-liquid phase separation tank 1 to separate the gas phase and the liquid phase. The separated liquid phase with a mass of about 2% returns to the synthesis section through the liquid phase pipeline; the separated gas phase enters the subsequent The absorption tower, the gas phase contains about 0.5% SO by mass 2 Gas, organic gas with about 0.1% moisture and 2% moisture, and the rest is air;

[0044] S2: The waste gas separated from the gas and liquid in step S1 is transported to the first-level absorp...

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Abstract

The invention provides a system and method for treating waste gas during synthesis of dimethyl sulfate. The system comprises a gas-liquid phase separation tank (1), an induced draft fan (2), a first primary absorption tower (3), a second primary absorption tower (4), a secondary absorption tower (5), an acid gas concentration detector (9) and a VOCs catalytic combustion system, wherein the gas-liquid phase separation tank (1) is used for separating the gas phase from the liquid phase in the waste gas which contains the liquid phase and is generated during synthesis of the dimethyl sulfate; thefirst primary absorption tower (3) and / or the second primary absorption tower (4) are connected to the top of the gas-liquid phase separation tank (1) through the induced draft fan (2); the secondaryabsorption tower (5) is connected with the first primary absorption tower (3) and / or the second primary absorption tower (4); the acid gas concentration detector (9) and the VOCs catalytic combustionsystem are connected with the secondary absorption tower (5). By means of the system, it can be achieved that neither waste salt nor the three wastes are generated in the whole waste gas treatment process, no corrosion to the device is generated, and the technology is simple.

Description

technical field [0001] The present invention generally relates to the technical field of chemical synthesis tail gas treatment, in particular to a waste gas treatment system and method in the synthesis of dimethyl sulfate. Background technique [0002] Dimethyl sulfate is an important chemical intermediate product and methylating agent. It is widely used in most industries of the national economy such as pharmaceutical industry, agriculture, textile industry, construction industry, petrochemical industry, paper industry, food industry, and daily chemical production. There are applications. [0003] At present, the reaction of dimethyl ether and sulfur trioxide is mostly used in industry to produce dimethyl sulfate: first dehydrate with methanol to obtain dimethyl ether; then heat 25% oleum to steam sulfur trioxide gas, spray it with dimethyl sulfate The sulfur trioxide gas is leached and absorbed to a state close to saturation as the mother liquor, and the dimethyl sulfate ...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/02B01J20/26B01J20/30B01J41/12F23G7/07
CPCB01D53/1406B01D53/1487B01D53/02B01J20/267B01J41/12F23G7/07B01D2258/0225
Inventor 唐强丰秀珍任立军靳辉
Owner BEIJING CHEM REACTION ENG SCI & TECH CO LTD
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