Method for producing nonyl phenol

Abstract

The invention discloses a method for producing nonyl phenol, which comprises the steps of: preheating phenol to a temperature between 115 DEG C and 125 DEG C, then fully mixing nonene at a room temperature with the preheated phenol, cooling to about 120 DEG C in a first-stage reactor, then putting in a second-stage reactor and dripping the nonene at the same time, cooling to the temperature of about 85 DEG C after the second-stage reaction, then reacting in a third-stage reactor and dripping the nonene at the same time, dephenolizing nonyl phenol reaction liquid obtained after three-stage reaction in a film evaporator, and distilling coarse nonyl phenol subjected to dephenolizing in a distilling still to obtain high-purity nonyl phenol. The method has the advantages of short reaction retention time, less by-products, small required power and low energy consumption, and the product produced has good quality. The whole production process is carried out continuously, has excellent stability, and improves production efficiency.

Description

technical field [0001] The invention relates to a production method of a compound, in particular to a production method of nonylphenol. Background technique [0002] Nonylphenol, also known as nonylphenol; the English name is Nonyl Phenol (NP for short); the molecular formula is C 15 h 24 O. Nonylphenol is an important fine chemical raw material and intermediate. It is a colorless or light yellow liquid at room temperature with a slight phenol smell. It is insoluble in water but soluble in acetone. Nonylphenol is mainly used in the production of surfactants, antioxidants, textile printing and dyeing auxiliaries, lubricating oil additives, pesticide emulsifiers, resin modifiers, resin and rubber stabilizers and other fields. [0003] The existing production method of nonylphenol is to react phenol and nonene to produce nonylphenol, and the domestic existing alkylation device for producing nonylphenol adopts a first-stage fixed-bed reaction device. Due to the large size of...

AI Technical Summary

Problems solved by technology

Due to the large size of the device, slow heat transfer and mass transfer, it brings many disadvantages: large power required, high energy consumption, only ordinary resin catalysts with low activity can be used, long residence time of materials, many dead ends, resulting in by-products Many, affecting product quality

However, the defect of this process is that there is an excessive reaction of phenol in the whole production process, and the ratio of nonene and phenol is not very ideal, thereby reducing the content of the product and the service life, selectivity and conversion rate of the catalyst

At the same time, there are also defects in the structure of the reactor. The use of a large reactor not only wastes the catalyst, but also makes the material unable to obtain sufficient residence time in the reactor, which affects the life of the catalyst itself, and at the same time cannot obtain better selectivity. and conversion rate

In addition, large reactors need to be stirred with high-power stirring rods, which will destroy the structure of the catalyst and waste energy consumption; other olefins, crude nonylphenol and dinonylphenol are not separated in more detail during rectification, thus affecting Overall nonylphenol content

No recycling of by-products is reflected throughout the production process, increasing production costs and waste disposal costs

In addition, this process does not add a dehydration system in the production process. After a long time of reaction, a small amount of moisture will be generated. There may be moisture in the product. The main thing is to protect the life of the catalyst. There should be no moisture in the catalyst production process.

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