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Process and apparatus for processing heavy byproducts in toluene oxidation process

A technology of oxidation process and treatment process, which can be used in hydrolysis to prepare carbonyl compounds, organic chemistry, petroleum industry, etc., can solve problems such as economic loss and low added value, and achieve the effect of reducing economic loss and improving economic benefits.

Active Publication Date: 2017-07-21
湖北科林博伦新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of oxidation of toluene and air, some deep oxides are inevitably produced. After these substances are separated from the corresponding target products, they form a substance collectively called heavy by-products. If not treated, the Can only be used as fuel (heat) with low added value, causing certain economic losses

Method used

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  • Process and apparatus for processing heavy byproducts in toluene oxidation process
  • Process and apparatus for processing heavy byproducts in toluene oxidation process
  • Process and apparatus for processing heavy byproducts in toluene oxidation process

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Embodiment 1

[0038] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 Given the schematic diagram of the technological process of the present invention and the installation schematic diagram of each key equipment, the technological process of the present invention comprises the following steps:

[0039] (1) Hydrolysis reaction

[0040]The heavy by-product A produced in the toluene oxidation process, the concentration of 35% sodium hydroxide solution B, process water (part of the process water from the light component tank) are added to the hydrolysis reactor 1, under the action of the agitator 15 , at a temperature of 200°C, a pressure of 1.8 MPa(G), and an oil-water mass ratio of 6:1, the hydrolyzable heavy by-products undergo hydrolysis under alkaline conditions. After a residence time of 95 min, the hydrolyzed solution and non- Condensed gas and non-condensable gas are discharged through the non-condensable gas control valve at the top of the hydrolysis react...

Embodiment 2

[0052] The difference between Example 2 and Example 1 is that the sodium hydroxide solution with a concentration of 35% (wt) in step (1) is changed to a potassium hydroxide solution with a mass concentration of 40%.

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Abstract

The invention discloses a process and apparatus for processing heavy byproducts in toluene oxidation process; the heavy byproducts in the toluene oxidation process are hydrolyzed under alkaline conditions, the hydrolysate is separated by a separation column into a light component and a heavy component, the light component is separated again into water, benzyl alcohol and benzaldehyde, the benzyl alcohol and benzaldehyde are returned to the original production process, part of the water is reused as process water for hydrolysis, the other part of the water is used as process water to desalt the heavy component by washing, saline water is recycled after the heavy component is desalted, and the desalted heavy oil is used as a heat source. By using the process and apparatus, it is possible to convert toluene-oxidized heavy byproducts into high-added-value products, benzyl alcohol and benzaldehyde, the produced saline water is recyclable for the production of a high-added-value product, sodium benzoate or benzoic acid, part of the heavy byproducts are converted into little heavy oil used as a fuel, and economic loss is lowered.

Description

technical field [0001] The invention relates to a by-product treatment process in a toluene oxidation process, in particular to a heavy by-product treatment process, and belongs to the technical field of organic chemical production. Background technique [0002] In chemical industry production, chlorine-free benzyl alcohol, benzaldehyde and other products can be prepared by oxidizing toluene with air, which is well adapted to the green chlorine-free requirements of the downstream pharmaceutical, spice and cosmetic industries. In the production process of oxidation of toluene and air, some deep oxides are inevitably produced. After these substances are separated from the corresponding target products, they form a substance collectively called heavy by-products. If not treated, the It can only be used as a fuel (heat) with low added value, resulting in certain economic losses. Therefore, a heavy by-product treatment process and device in the toluene oxidation process is sough...

Claims

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Application Information

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IPC IPC(8): C07C29/09C07C33/22C07C45/42C07C47/54C10L1/04
CPCC07C29/09C07C45/42C10L1/04C07C33/22C07C47/54
Inventor 宛捍东潘中华
Owner 湖北科林博伦新材料有限公司
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