Low-consumption environment-friendly efficient phosgene synthesis technology

A technology of phosgene and chlorine, which is applied in the direction of carbonyl chloride, etc., can solve the problems of unused steam recovery, low absolute pressure of coolant space, deactivation of activated carbon catalyst, etc.

Inactive Publication Date: 2015-12-30
QINGDAO UNIV OF SCI & TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the absolute pressure of the coolant space is lower than the atmospheric pressure, so the coolant system must not only be a closed system, but also need corresponding vacuum equipment, and the vapor generated by evaporation is not recycled.
[0009] The high temperature in the known phosge

Method used

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  • Low-consumption environment-friendly efficient phosgene synthesis technology
  • Low-consumption environment-friendly efficient phosgene synthesis technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: as figure 2 Shown is the proposed two-stage main reactor process for the industrial production of phosgene according to the present invention.

[0024] Known 7100kg / h of Cl 2 Accurate metering of CO with 2856kg / h (CO to Cl 2 After the volume excess ratio is 2%), all the CO and 6745kg / h (95% of the total amount of chlorine) of chlorine enter the main reactor R1 before phosgene through the mixer M1, and the CO and Cl in R1 2 The molecular ratio of the reaction is about 1.07:1, the temperature of the R1 outlet material is about 180°C, the outlet material is phosgene 8415kg / h, the unreacted CO 476kg / h, the unreacted chlorine gas 710kg / h; the R1 outlet material and the unreacted M1 After the 625kg / h residual chlorine is mixed, it enters the rear main reactor R2, and CO and Cl in R2 2 The molecular ratio of the reaction is about 1.13. The heat released by the former main reaction is 2.36Mkcal / h, which can produce 4547.76kg / h of low-pressure steam, and the c...

Embodiment 2

[0025] Embodiment 2: as figure 2 Shown is the proposed two-stage main reactor process for the industrial production of phosgene according to the present invention.

[0026] Known 7100kg / h of Cl 2 Accurate metering of CO with 2856kg / h (CO to Cl 2 After the volume excess ratio is 2%), all the CO and 6390kg / h of chlorine enter the main reactor R1 before phosgene through the mixer M1, and the CO and Cl in R1 2 The molecular ratio of the reaction is about 1.13:1, the outlet temperature of R1 is about 150°C, the outlet gas phase mixture is phosgene 7920kg / h, unreacted CO616kg / h, unreacted chlorine gas 710kg / h; R1 outlet material and the unreacted M1 After the 710kg / h remaining chlorine gas is mixed, it enters the rear main reactor R2, and CO and Cl in R2 2 The molecular ratio of the reaction is about 1.10:1. The heat released by the former main reaction is 2.22Mkcal / h, which can produce 4280.25kg / h of low-pressure steam, and correspondingly add warm water of 4280.25kg / h. The h...

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Abstract

The invention provides a series technology for producing phosgene in industry. Different from the traditional phosgene production technology in which one protection reactor is connected to the rear part of one main phosgene reactor, the technology provided by the invention adopts the scheme that one protection reactor is connected to the rear parts of two main reactors; the catalyst loading capacity of each main reactor is halved; the feeding of chlorine gas as a feed gas is divided into two parts, namely, one part of the chlorine gas enters the first main reactor, and the other part of the chlorine gas enters the second main reactor; when catalysts are replaced, a catalyst in the rear reactor is put into the front reactor, and a new catalyst is put into the rear reactor. Through the adoption of the technology, catalysts can be saved; besides, by virtue of the separate feeding of chlorine gas, the total matching ratio of the feed gas and carbon monoxide can be reduced, so that the consumption amount of carbon monoxide is reduced.

Description

technical field [0001] The invention relates to a method for industrially synthesizing phosgene by reacting carbon monoxide and chlorine. The method adopts a two-stage synthesis process to achieve the purpose of saving catalyst and carbon monoxide consumption; at the same time, by recovering the reaction heat of the previous stage of phosgene synthesis and reducing the subsequent stage of synthesis The amount of circulating water outside the device is used to reduce energy consumption. Background technique [0002] There are many methods for preparing phosgene, such as: carbon monoxide and chlorine mixed light method, carbon monoxide and chlorine gas are synthesized with chlorophosphine catalyst, carbon monoxide is reacted in metal chloride at high temperature, fuming sulfuric acid and carbon tetrachloride are reacted, and chromic acid is used to synthesize phosgene. Oxidation of aliphatic chlorides and thermal decomposition of trichloromethyl chloroformate and perchlorometh...

Claims

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Application Information

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IPC IPC(8): C01B31/28C01B32/80
Inventor 岳金彩杨霞张伟郑世清
Owner QINGDAO UNIV OF SCI & TECH
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