Hydrogen chloride whole reclaiming zero discharging technique and device for PVC producing process

A production process, hydrogen chloride technology, applied in the addition preparation of hydrogen halide, organic chemistry and other directions, can solve the problems of the quality of vinyl chloride refining, difficult to contain mercury hydrochloric acid, environmental pollution and other problems

Active Publication Date: 2008-08-06
仇晓丰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The washing tower must continuously discharge waste water containing dilute acid and vinyl chloride, which not only causes considerable losses, but also pollutes the environment, constitutes a safety hazard, and increases the investment in pollution control;
[0004] (2) Hydrogen chloride cannot be recycled as raw material gas for the synthesis of vinyl chloride, and the by-product produced is low-concentration mercury-containing hydrochloric acid that is difficult to sell directly;
[0005] (3) The proc

Method used

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  • Hydrogen chloride whole reclaiming zero discharging technique and device for PVC producing process
  • Hydrogen chloride whole reclaiming zero discharging technique and device for PVC producing process
  • Hydrogen chloride whole reclaiming zero discharging technique and device for PVC producing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 5400m at 40°C with a pressure of 10kPa 3 / h The mixed gas of vinyl chloride containing hydrogen chloride enters from the lower part of the combined tower 1, and first passes through an isothermal absorption zone 1a, the temperature of the mixed gas of vinyl chloride containing hydrogen chloride gradually decreases, and part of the hydrogen chloride gas is absorbed. The absorber used is a proprietary graphite falling film absorber. Hydrogen chloride gas is absorbed after full contact with the liquid film evenly distributed on the surface of the tube (or short hole), and the heat released is removed by the cooling water on the shell side.

[0064] The mixed gas passing through the isothermal absorption zone 1a enters the upper concentrated acid absorption zone 1b, which is a layer of packing zone. The mixed gas passing through the isothermal absorption zone 1a enters from the bottom of a layer of packing area, passes through the free space in the filler gap of the packing a...

Embodiment 2

[0074] Other steps and processing condition are identical with embodiment 1, difference is: in the concentrated sulfuric acid desorption method:

[0075] 21% dilute hydrochloric acid and 98% concentrated sulfuric acid enter the hydrochloric acid tank 63 and the sulfuric acid tank 64 respectively, and then are pumped into the hydrochloric acid head tank 67 and the sulfuric acid head tank 68 by the hydrochloric acid pump 65 and the sulfuric acid pump 66 respectively. When the liquid return pipe is normal, the hydrochloric acid in the hydrochloric acid high level tank 67 is adjusted and metered by the flow meter and then enters the upper part of the extractor 61, wherein the volume ratio of concentrated sulfuric acid to dilute hydrochloric acid is 3:1, and then the sulfuric acid in the sulfuric acid high level tank 68 is After the flow is adjusted and metered, it enters the middle part of the extractor 61. The two acids overflow and mix continuously in the tank of the extractor 61...

Embodiment 3

[0079] Other steps and processing condition are identical with embodiment 1, difference is: in the concentrated sulfuric acid desorption method:

[0080] 19% dilute hydrochloric acid and 98% concentrated sulfuric acid enter the hydrochloric acid tank 63 and the sulfuric acid tank 64 respectively, and then are pumped into the hydrochloric acid head tank 67 and the sulfuric acid head tank 68 by the hydrochloric acid pump 65 and the sulfuric acid pump 66 respectively, and the overflow of the two head tanks When the liquid return pipe is normal, the hydrochloric acid in the hydrochloric acid high level tank 67 is adjusted and metered by the flow meter and then enters the upper part of the extractor 61, wherein the volume ratio of concentrated sulfuric acid to dilute hydrochloric acid is 4:1, and then the sulfuric acid in the sulfuric acid high level tank 68 is After the flow is adjusted and metered, it enters the middle part of the extractor 61. The two acids overflow and mix conti...

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Abstract

The invention discloses a hydrochloride total-recover zero-discharge method in PVC production and a relative equipment, which uses a new absorber as hydrochloride combination adsorption tower, an alcaine desorption equipment and a dilute hydrochloric acid deep desorption equipment as main equipments, uses the combination adsorption tower to absorb the over hydrochloride in the chloroethylene production and uses the alcaine desorption equipment and dilute hydrochloric acid deep desorption equipment to convert into the synthesis gas material of chloroethylene. The invention can directly convert the low-density alcaine generated in traditional method into the synthesis gas material of chloroethylene, to save production cost, avoid environment pollution and simplify hydrochloride recovery, with few equipments, small volume, thereby saving investment.

Description

field of invention [0001] The present invention relates to vinyl chloride production technology and equipment, specifically, a process and equipment for full recovery of excess hydrogen chloride in the PVC production process. Background technique [0002] In the process of synthesizing vinyl chloride by the reaction of acetylene and hydrogen chloride, in order to increase the conversion rate of acetylene, an economical and feasible way is to allow excess hydrogen chloride in the raw material gas. In the actual production process, acetylene and hydrogen chloride are usually controlled to n(C 2 h 2 ): n (HCl) = 1: (1.05-1.10), the excess hydrogen chloride treatment process in the existing vinyl chloride production process is that at first the crude vinyl chloride comes out from the converter, enters the mercury remover and uses active carbon adsorption to mainly contain chlorine and high mercury compounds After the mercury vapor is released, it enters the synthesis gas graph...

Claims

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Application Information

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IPC IPC(8): C08J11/02C08F114/06C07C21/06C07C17/08
Inventor 仇晓丰
Owner 仇晓丰
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