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A kind of preparation method of secondary alcohol

A secondary alcohol and crude technology is applied in the field of preparation of secondary alcohols, which can solve the problems of high risk, low desirability, and lower economic indicators of the production process in the hydrogenation process, so as to improve the quality of secondary alcohol products, improve the color quality, The effect of reducing the content of double bond compounds

Active Publication Date: 2021-01-01
SHANGHAI WOOLEN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent US 33446614 discloses a method for reducing chroma by hydrogenating secondary alcohols. The quality of secondary alcohols can be improved by means of industrial hydrogenation, but this method reduces the economic indicators of the production process, and the hydrogenation process is highly dangerous. Therefore, the method is less desirable

Method used

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  • A kind of preparation method of secondary alcohol
  • A kind of preparation method of secondary alcohol
  • A kind of preparation method of secondary alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Crude secondary alcohol plus alkali pretreatment + rectification after washing:

[0049] In this example, the crude secondary alcohol has undergone an alkali pretreatment process before rectification, and the alkali pretreatment is carried out in a batch stirring tank, the reaction temperature is 150°C, the reaction time is 90min, and the amount of alkali is 5wt% of the crude secondary alcohol mass . After the alkali pretreatment reaction is completed, wash with water until the washing water is neutral, and the crude secondary alcohol is separated in a rectification tower. The fraction information is shown in Table 3:

[0050] table 3

[0051]

[0052]

[0053] In the crude secondary alcohol pretreatment process, the content distribution of chromogenic substances in the rectification fraction showed a hysteresis trend. The pretreatment process realized the polycondensation of some chromogenic substances, and the carbonyl value of each fraction decreased to varyin...

Embodiment 2

[0055] Direct distillation of crude secondary alcohol after pretreatment:

[0056] This example saves the water washing process compared with the operation in Example 2, and the reaction conditions are the same as Example 2. The high-temperature reaction ends, and the crude secondary alcohol is directly separated from the rectifying tower without washing after cooling. The information of each fraction is shown in Table 4:

[0057] Table 4

[0058]

example 2

[0059] Compared with Example 2, the rectification process in this example contains part of the residual alkali in the crude secondary alcohol pretreatment process, and this part of the alkali has played the role of aldol condensation reaction rectification catalyst in the rectification process, and the degree of condensation reaction increases so that The degree of condensation of the chromogenic component increases, but in this case, the alkali catalyst undergoes an irreversible change after high-temperature pretreatment, resulting in a decrease in its catalytic effect and affecting product quality.

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Abstract

The invention relates to a preparation method for secondary alcohol, which comprises a step of performing alkaline pretreatment on rough secondary alcohol and / or a step of performing distillation with chemical reaction while carrying alkali. Compared with the prior art, the method provided by the invention simplifies the preparing process and improves product quality of the secondary alcohol by combining aldol condensation and alkaline pretreatment and / or distillation with chemical reaction to be applied to the process for preparing the secondary alcohol.

Description

technical field [0001] The invention belongs to the technical field of refining secondary alcohols, and in particular relates to a preparation method of secondary alcohols. Background technique [0002] With the improvement of people's living standards, liquid surfactants play an increasingly important role in life. After several changes in the global detergent industry, it is currently developing in the direction of high efficiency, environmental protection, low toxicity, low irritation, and high safety. Driven by the general environment, high-grade alcohol non-ionic detergents and surfactants are getting faster Among them, secondary alcohol polyoxyethylene ether series surfactants and detergents have attracted much attention due to their strong decontamination ability and wide application range. [0003] Secondary alcohol polyoxyethylene ether surfactants are obtained from the ethoxylation addition reaction of high carbon number secondary alcohols with ethylene oxide or p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/74C07C29/80C07C29/88C07C31/02
CPCC07C29/74C07C29/80C07C29/88C07C31/02Y02P20/10
Inventor 崔喜李迪川
Owner SHANGHAI WOOLEN CHEM TECH CO LTD