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Method for recovering chloroform and hydrogen chloride in production process of methyl isocyanate

A technology for the production process of methyl isocyanate, which is applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, chemical instruments and methods, etc., can solve problems such as poor recovery effect, and achieve the effect of simple operation and reduced production cost

Pending Publication Date: 2020-08-18
安道麦股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery effect is poor

Method used

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  • Method for recovering chloroform and hydrogen chloride in production process of methyl isocyanate
  • Method for recovering chloroform and hydrogen chloride in production process of methyl isocyanate

Examples

Experimental program
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Effect test

Embodiment 1

[0033] This embodiment discloses a method for recovering chloroform and hydrogen chloride in the production process of methyl isocyanate, which comprises the following steps:

[0034] 1) The tail gas comprising chloroform and hydrogen chloride passes through the condenser to realize the condensation of chloroform gas. Most of the chloroform gas is condensed into a liquid state and captured, and the remaining chloroform and hydrogen chloride gas are sprayed into the hydrochloric acid mixed solution through the water spray of the falling film absorber; 2) the hydrochloric acid mixed solution in step 1) is cooled to 30 ° C, and then along the layered The tangential liquid inlet provided on the side of the stratifier is sent into the stratifier, and baffles and rotations occur in the baffles inside the stratifier to make the chloroform and hydrochloric acid settle and stratify. The overflow port set on the top flows into the hydrochloric acid circulation tank, and the chloroform f...

Embodiment 2

[0036] This embodiment discloses a method for recovering chloroform and hydrogen chloride in the production process of methyl isocyanate, which comprises the following steps:

[0037] 1) The tail gas comprising chloroform and hydrogen chloride passes through a condenser, wherein the condenser is used to condense chloroform gas. Most of the chloroform gas is condensed into a liquid state and captured, and the remaining chloroform and hydrogen chloride gas are sprayed into a hydrochloric acid mixture through the water spray of the falling film absorber;

[0038]2) The hydrochloric acid mixture in step 1) is cooled to 50°C, and then the tangential liquid inlet arranged along the side of the layerer is sent into the first layerer, and each layer arranged inside the first layerer The deflection and rotation occur in the baffle, so that the chloroform and hydrochloric acid settle and stratify. Among them, the hydrochloric acid flows into the hydrochloric acid circulation tank along ...

Embodiment 3

[0040] This embodiment discloses a method for recovering chloroform and hydrogen chloride in the production process of methyl isocyanate, which comprises the following steps:

[0041] 1) The tail gas comprising chloroform and hydrogen chloride passes through a condenser, wherein the condenser is used to condense chloroform gas. Most of the chloroform gas is condensed into a liquid state and captured, and the remaining chloroform and hydrogen chloride gas are sprayed into the hydrochloric acid mixed solution through the water spray of the falling film absorber; 2) the hydrochloric acid mixed solution in step 1) is cooled to 50 ° C, and then along the layered The tangential liquid inlet provided on the side of the device is sent into the stratifier. In this embodiment, three stratifiers are preferably arranged in series, that is, the tangential liquid inlets of adjacent stratifiers are connected to the liquid discharge ports. Other settings are the same as in Embodiment 2.

[0...

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Abstract

The invention discloses a method for recovering chloroform and hydrogen chloride in a methyl isocyanate production process, and belongs to the technical field of fine chemical production. The production method of the methyl isocyanate comprises the following steps: synthesizing methylaminoformyl chloride from phosgene and monomethylamine; methylaminoformyl chloride is decomposed into methyl isocyanate and tail gas containing chloroform and hydrogen chloride, and the method comprises the following steps: 1, enabling the tail gas containing chloroform and hydrogen chloride to flow through a condenser, wherein most of chloroform gas is condensed into liquid and captured, and the remaining chloroform and hydrogen chloride gas is sprayed into a hydrochloric acid mixed solution through water ofa falling film absorber; 2) cooling the hydrochloric acid mixed solution obtained in the step 1) to 20-60 DEG C, then, a tangential liquid inlet formed in the side part of the layering device is fed into the layering device, wherein baffling and rotation form in each baffle arranged in the layering device, so that the chloroform and hydrochloric acid are settled and layered; wherein hydrochloric acid flows into the hydrochloric acid circulating tank along an overflow port formed in the top of the layering device, whereas chloroform flows into the chloroform receiving kettle from a liquid outlet formed in the bottom of the layering device, and remaining mixed liquid in the layering device is fed into the layering device again along the liquid outlet and the tangential liquid inlet.

Description

technical field [0001] The invention relates to recovery of a reaction solvent and by-products, belongs to the technical field of fine chemical production, and in particular relates to a recovery method of chloroform and hydrogen chloride in the production process of methyl isocyanate. Background technique [0002] Chloroform term name Chloroform (CHCl 3 ), main physical and chemical properties: colorless transparent liquid, special smell, sweet taste, high refractive index, low toxicity, non-flammable, heavy, volatile. The pure product is sensitive to light, it will interact with oxygen in the air when exposed to light, and gradually decompose to produce highly toxic phosgene (carbonyl chloride) and hydrogen chloride. The relative density is 1.484, the freezing point is -63.5°C, the boiling point is 61.3°C, and the refractive index is 1.4476. [0003] The domestic production method of methyl isocyanate is to synthesize methylcarbamoyl chloride (CH 3 NHCOCl), and then use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C19/04C01B7/07
CPCC07C17/38C01B7/0706C07C19/04
Inventor 李子平高德喜李金元
Owner 安道麦股份有限公司
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