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System and technology for producing chlorosulfonic acid from m/p-phthaloyl chloride tail gas

A technology for phthaloyl chloride tail gas and production system, which is applied in chlorosulfonic acid, inorganic chemistry, non-metallic elements, etc., can solve the problem that chlorosulfonic acid production equipment is easy to corrode, by-products are difficult to sell, and there is a long-term backlog, and the degree of raw material pretreatment is high. problems, to achieve the effect of reducing m/terephthaloyl chloride tail gas, solving the backlog of by-products, and reducing environmental risks

Inactive Publication Date: 2019-02-15
SHANDONG KAISHENG NEW MATERIALS
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  • Abstract
  • Description
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Problems solved by technology

This method has the following problems: (1) high impurity content of by-products, difficult to reuse; (2) high energy consumption, difficult to sell long-term backlog of by-products produced; (3) large consumption of water and liquid caustic soda, resulting in waste of resources
[0003] The existing chlorosulfonic acid production process and equipment are complicated, the raw material pretreatment degree is high in the early stage, and the chlorosulfonic acid production equipment has the disadvantages of easy corrosion, damage, replacement, and frequent maintenance; the production tail gas is difficult to treat, high energy consumption, and serious waste of resources. Easy to generate environmental pollution problems

Method used

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  • System and technology for producing chlorosulfonic acid from m/p-phthaloyl chloride tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The system of producing chlorosulfonic acid from the m / terephthaloyl chloride tail gas described in present embodiment 1, with reference to the attached figure 1 , including tail gas pretreatment system, chlorosulfonic acid production system and sulfur dioxide treatment and recovery system. In the tail gas pretreatment system, the gas phase outlet at the top of the absorption tower 3 is connected to the lower part of the tail gas condenser 4, and the tube side of the tail gas condenser 4 is used. Divided into two ways.

[0049] Come out from mist catcher 5 and be divided into two roads, all the way enters primary reaction tower 6 from the bottom side of primary reaction tower 6, in primary reaction tower 6, enters the liquid sulfur trioxide of primary reaction tower 6 with the top Reaction, after the reaction gas phase is condensed by the circulating condenser 9, it is refluxed into the first-stage reaction tower 6, and the reaction liquid at the bottom of the first-st...

Embodiment 2

[0062] Compared with Example 1, this embodiment 2 differs only in that the temperature in the primary reaction tower 6 is maintained at 45±5°C, the outlet temperature of the primary condenser 10 is maintained at 35±5°C, and the temperature of the secondary reaction tower 7 is maintained at 45±5°C. kept at 58±8°C, the outlet temperature of secondary condenser 12 was kept at 55±10°C, SO 3 The conversion tank 16 is a sulfuric acid absorption tank, and the concentrated sulfuric acid with a content of 98% is added therein.

[0063] In terms of mass fraction, the tail gas of m / terephthaloyl dichloride consists of the following components: SO 2 63.5%, HCl 36%, acid chloride 0.5%.

[0064] Liquid SO 3 excess. Liquid SO 3 The volume ratio of iso / terephthaloyl chloride tail gas is 1:1500.

[0065] The air pressure at the top outlet of the first-stage reaction tower is 1-2KPa; the air pressure at the top outlet of the second-stage reaction tower is 2-4KPa.

[0066] The residence t...

Embodiment 3

[0069] Compared with Example 1, this embodiment 3 differs only in that the temperature in the primary reaction tower 6 is maintained at 55±5°C, the outlet temperature of the primary condenser 10 is maintained at 35±5°C, and the temperature of the secondary reaction tower 7 is maintained at 55±5°C. kept at 75±5°C, the outlet temperature of secondary condenser 12 was kept at 55±10°C, SO 3 The conversion tank 16 is a sulfuric acid absorption tank, and the concentrated sulfuric acid with a content of 98% is added therein.

[0070] In terms of mass fraction, the tail gas of m / terephthaloyl dichloride consists of the following components: SO 2 63.5%, HCl 36%, acid chloride 0.5%.

[0071] Liquid SO 3 excess. Liquid SO 3 The volume ratio of iso / terephthaloyl chloride tail gas is 1:1500.

[0072] The air pressure at the top outlet of the first-stage reaction tower is 1-2KPa; the air pressure at the top outlet of the second-stage reaction tower is 2-4KPa.

[0073] The residence t...

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Abstract

The invention belongs to the technical field of tail gas treatment, and particularly relates to a system and a technology for producing chlorosulfonic acid from m / p-phthaloyl chloride tail gas. The system comprises a tail gas pretreating system, a chlorosulfonic acid producing system and a sulfur dioxide treating and recycling system. By the technology, a gas phase-liquid phase countercurrent contact reaction is performed on the m / p-phthaloyl chloride tail gas and excess liquid sulfur trioxide. Acyl chloride tail gas passes through an absorption tower, a tail gas condenser and a mist trapper sequentially and enters primary and secondary reaction towers respectively, and after a cyclic reaction, reaction liquid at the bottom of the secondary reaction tower passes through a product condenserand enters a finished product storage tank and a gas phase part on the top of the tower enters a sulfur dioxide storage tank after further sulfuration, compression and condensation. According to thesystem and the technology for producing the chlorosulfonic acid from the m / p-phthaloyl chloride tail gas, the system is reasonable in design and a method is simple; and through the system and the technology, the tail gas produced in the production of m / p-phthalic acid chloride is fully utilized, so that the added value of a byproduct is increased and the problem of overstock of the byproduct is solved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a system and a process for producing chlorosulfonic acid from tail gas of iso / terephthaloyl dichloride. Background technique [0002] At present, my country's production enterprises mainly use the thionyl chloride method or the phosgene method to produce acyl chlorides. The tail gas produced by the reaction mainly contains hydrogen chloride and sulfur dioxide. Domestically, the tail gas is mainly absorbed by water absorption, compression condensation, and alkali absorption. The method has the following problems: (1) high impurity content of the by-products and difficulty in reuse; (2) high energy consumption and long-term backlog of the produced by-products which are difficult to sell; (3) large consumption of water and liquid caustic soda, resulting in waste of resources. [0003] The existing chlorosulfonic acid production process and equipment are compli...

Claims

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Application Information

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IPC IPC(8): C01B17/46C01B17/50
CPCC01B17/466C01B17/50C01P2006/80
Inventor 孙丰炜谢圣斌张良刘嵩王廷常莹
Owner SHANDONG KAISHENG NEW MATERIALS
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