Method for completely removing acidic substances in crude vinyl chloride gas

A technology for crude vinyl chloride and acidic substances, applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of high VCM loss of vinyl chloride, waste of lye, equipment corrosion, etc., to reduce the workload and ensure efficiency , the effect of saving energy consumption
CN109232171AActive Publication Date: 2019-01-18QINGDAO UNIV OF SCI & TECH +2
3 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Publication Date
2019-01-18

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

The invention relates to a method for completely removing acidic substances in crude vinyl chloride gas. A device comprises two parts including hydrogen chloride absorption and double-tower alkali washing; a technological flow comprises the following steps: conveying the crude vinyl chloride gas into a hydrogen chloride combined absorption tower; carrying out two grades of absorption through dilute hydrochloric acid and concentrated hydrochloric acid respectively, and then conveying the crude vinyl chloride gas into a dilute hydrochloric acid tower to finish whole absorption of hydrogen chloride in the dilute hydrochloric acid tower; conveying the crude vinyl chloride gas ejected out from the dilute hydrochloric acid tower into an alkali washing tower I; washing the crude vinyl chloride gas by utilizing alkali liquid in the alkali washing tower I; then conveying the crude vinyl chloride gas into an alkali washing tower II; then washing the crude vinyl chloride gas by utilizing high-concentration alkali liquid so as to ensure that the acidic substances in the crude vinyl chloride gas are completely removed. According to the method provided by the invention, the acidic substances inthe crude vinyl chloride gas from a converter can be completely absorbed to form hydrochloric acid with the concentration of 29 to 31 weight percent, so that the loss of the vinyl chloride is reducedand damages to subsequent treatment equipment are reduced; the consumption of alkali and fresh water can be reduced through two-grade alkali washing, the amount of discharged wastewater can also be reduced and pollution to the environment is extremely alleviated.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field:

[0001] The invention relates to a method for removing acidic substances in mixed gas produced by calcium carbide acetylene hydrochlorination, in particular to a method for completely removing acidic substances in crude vinyl chloride gas, belonging to the technical field of gas purification. Background technique:

[0002] Polyvinyl chloride (PVC) has excellent comprehensive properties and is one of the five general-purpose synthetic resins, widely used in various fields of the national economy. In the past 10 years, my country's PVC production capacity has increased rapidly, and by the end of 2012, the production capacity had reached 24 million tons, accounting for about half of the world's total production capacity. In view of the resource characteristics of rich coal and poor oil in our country, most domestic PVC manufacturers use the calcium carbide method to produce vinyl chloride. The main reaction is that acetylene and hydrogen chloride are catalyzed b...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More