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Method of producing o-tert-butyl phenol and p-tert-butyl phenol through combination of rectification and crystallization

A technology of p-tert-butylphenol and o-tert-butylphenol, which is applied in the field of chemical separation, can solve the problems of easy adhesion of amorphous substances, easy growth of impurities into the crystal lattice, and decrease in product purity.

Active Publication Date: 2020-02-04
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, crystallization also has the problem of eutectic point. Simple crystallization cannot break through the eutectic point, resulting in product waste; and impurities are easy to grow into the crystal lattice, and amorphous substances are easy to adhere to the crystal surface or be wrapped by the crystal lattice, resulting in a decrease in product purity.

Method used

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  • Method of producing o-tert-butyl phenol and p-tert-butyl phenol through combination of rectification and crystallization
  • Method of producing o-tert-butyl phenol and p-tert-butyl phenol through combination of rectification and crystallization
  • Method of producing o-tert-butyl phenol and p-tert-butyl phenol through combination of rectification and crystallization

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 (S1)

[0037] Such as figure 1 Shown, a kind of rectification and crystallization are used to produce the method for o-tert-butylphenol and p-tert-butylphenol, comprising the following steps:

[0038] (1) The alkylation product obtained by the alkylation reaction of phenol and isobutene is fed into the first rectification tower 1 through the fifth pipeline 12 for rectification treatment, so that the phenol and light components with a boiling point less than 110°C are contained therein The by-product is separated from o-tert-butylphenol and p-tert-butylphenol; when the top temperature of the first rectification tower 1 reaches 92°C and the bottom temperature reaches 138°C, the The first overhead material including phenol and light component by-products with a boiling point less than 110°C is extracted from the top of the tower, part of the first overhead material is refluxed after being condensed by the first condenser 5, and the remaining part is returned to ...

Embodiment 2 and 3

[0042] Embodiment 2 and 3 (S2 and S3)

[0043] The steps of Examples 2 and 3 are the same as in Example 1. The composition of the alkylation product stream is shown in Table 1, the operating conditions of the first rectifying tower 1 are shown in Table 2, and the operating conditions of the second rectifying tower 2 are shown in Table 3.

[0044] The composition of the alkylation product stream in Table 1 S1-3 and the content of each composition

[0045]

[0046] Process conditions of the first rectifying tower in table 2 S1-3

[0047]

[0048] Note: The feeding position refers to the feeding of the first rectification column at the n1th tray from top to bottom.

[0049] Process conditions of the second rectifying tower in table 3 S1-3

[0050]

[0051] Note: The meanings of n2, n3 and n4 are similar to n1.

[0052] Process conditions of the four treatment processes in the crystallization unit in Table 4 S1-3

[0053]

[0054] Examples 1-3 all can obtain o-tert-b...

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Abstract

The invention discloses a method of producing o-tert-butyl phenol and p-tert-butyl phenol through combination of rectification and crystallization. The method comprises the steps that (1) an alkylatedproduct flow obtained through a reaction between phenol and isobutene is input into a first rectifying tower for rectification treatment, a first tower top material which contains the phenol and a light-component byproduct is extracted from the tower top, and a first tower bottom material which contains the o-tert-butyl phenol, the p-tert-butyl phenol and a heavy-component byproduct is extractedfrom the tower bottom; (2) the first tower bottom material is input into a second rectifying tower for rectification treatment, an OTBP product is extracted from the tower top, a second side-line material which contains the p-tert-butyl phenol is extracted from a side line, and a second tower bottom material which contains 2,4-di-tert-butyl phenol and a heavy-component byproduct is extracted fromthe tower bottom; and (3) the second side-line material is input into a crystallization unit, so that the p-tert-butyl phenol in the second side-line material is cooled and crystallized, and after impurities are separated, the temperature is increased for fusing and discharging to obtain a PTBP product. According to the method, through coupling of the rectification technology and the crystallization technology, the problem of eutectic point limitation can be broken, and the product purity is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, in particular to a method for producing o-tert-butylphenol and p-tert-butylphenol through rectification and crystallization. Background technique [0002] Tert-butylphenol is produced by alkylation of phenol with isobutylene and tert-butanol. It is an important fine chemical product with high added value. It is used as a kind of surfactant in the fields of surfactants, antioxidants, paints and coatings Important additives are widely used. [0003] At present, there are many synthesis methods for tert-butylphenol, especially the introduction of catalysts, but few introductions for the separation of subsequent products. The boiling points of o-tert-butylphenol (OTBP), p-tert-butylphenol (PTBP) and di-tert-butylphenol are close, so separation by rectification requires more theoretical plates and consumes a lot of energy. Although there is an introduction about the continuous rectificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/70C07C37/74C07C37/84C07C39/06
CPCC07C37/685C07C37/70C07C37/74C07C37/84C07C39/06
Inventor 刘齐兴乔小飞代红涛薛勇勇林少宁赵楠
Owner WANHUA CHEM GRP CO LTD
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