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Methylbenzene raw material system in production process of benzoic acid and process flow

A production process, the technology of benzoic acid, applied in the field of toluene raw material system and process flow, can solve the problems of not being able to exert the production efficiency of oxidation equipment, and achieve the effects of protecting the environment, saving energy and reducing pollution

Inactive Publication Date: 2010-04-28
TIANJIN DONGDA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the period of heating the toluene at normal temperature in the oxidation tower, the oxidation tower is only used as a heating container, and cannot exert the production efficiency of its oxidation equipment

Method used

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  • Methylbenzene raw material system in production process of benzoic acid and process flow
  • Methylbenzene raw material system in production process of benzoic acid and process flow
  • Methylbenzene raw material system in production process of benzoic acid and process flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the toluene raw material system including toluene storage and irrigation, toluene pump, oxidation tower and other equipment in the benzoic acid production process, a toluene preheater is arranged between the toluene pump and the oxidation tower. The toluene preheater is provided with a steam inlet and a steam outlet, a toluene inlet and a toluene outlet; the shell side is steam, and the tube side is toluene. The steam inlet of the toluene preheater is connected to the exhaust steam trap to provide exhaust steam or boiler steam. Open the steam outlet valve of the toluene preheater, and then slowly open the steam inlet valve; let the exhaust steam trap steam or boiler steam enter the toluene preheater through the inlet valve of the steam pipeline of the toluene preheater; remove the steam Condensed water in the pipe; open the inlet and outlet valves of the toluene pump pipeline; open the toluene inlet and outlet valves of the toluene preheater; open the inlet valve of ...

Embodiment 2

[0020] In Example 1, the vapor pressure of the exhaust steam trap is 0.3Mpa, and when the temperature is about 143°C, normal temperature state toluene and 0.3Mpa, the vapor trap steam with a temperature of about 143°C are heat-exchanged in the toluene preheater; When the temperature of toluene at normal temperature reaches 115°C-120°C, it enters the oxidation tower through the inlet valve of the toluene pipeline of the oxidation tower, and then heats up to 160°C-165°C, and the toluene at this temperature is oxidized in the oxidation tower reaction.

Embodiment 3

[0022] When the boiler steam pressure in Example 1 reaches 0.6Mpa and the temperature is about 158°C, normal temperature state toluene and 0.6Mpa, the boiler steam with a temperature of about 158°C are heat exchanged in the toluene preheater; when the temperature of normal temperature state toluene reaches 120 ℃~125℃, enter the oxidation tower through the inlet valve of the toluene pipeline of the oxidation tower, and then heat up to 165℃~168℃, the toluene at this temperature value undergoes oxidation reaction in the oxidation tower.

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Abstract

The invention relates to a methylbenzene raw material system in production process of benzoic acid and a process flow. In the methylbenzene raw material system in the production process of the benzoic acid, a methylbenzene preheater is arranged between a methylbenzene pump and an oxidation tower, and is provided with a steam outlet, a steam inlet, a methylbenzene inlet and a methylbenzene outlet; and the shell pass is steam, the tube pass is methylbenzene, and the steam inlet is connected with a waste steam catcher to provide dead steam or boiler steam. The process flow comprises the following steps: firstly, removing condensed water in a steam pipe, and making the methylbenzene in a normal temperature state enter the methylbenzene preheater through an inlet valve of a methylbenzene pipeline of the methylbenzene preheater; and heating to a temperature of between 115 and 125DEG C, introducing the methylbenzene to the oxidation tower, and performing oxidation reaction on the methylbenzene in the oxidation tower when the temperature of the methylbenzene is between 160 and 170DEG C. The conventional production flow of the benzoic acid is changed, the productive efficiency of the oxidation tower is fully exerted, and the aim of saving energy is achieved. Considerable economic benefits are brought to enterprises, the pollution is lightened, the energy is saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to a toluene raw material system and a process flow in the production process of benzoic acid. Background technique [0002] In the production process of orthobenzoic acid, the toluene at normal temperature needs to be pumped into the oxidation tower by the toluene storage and filling before the oxidation reaction of toluene occurs, such as figure 1 As shown, toluene in the normal temperature state undergoes oxidation reaction when the temperature in the oxidation tower is raised to 160° C. to 170° C. During the period of time when the normal-temperature toluene in the oxidation tower is heated up, the oxidation tower is only used as a heat receiving container, and the production efficiency of its oxidation equipment cannot be brought into play. Reduced yield of benzoic acid production. Contents of the invention [0003] According to the specific ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/06C07C51/16
CPCY02P20/10
Inventor 赵富贵
Owner TIANJIN DONGDA CHEM GRP