Nonyl phenol refining process

Abstract

The invention discloses a refining technique to synthesize industrial nonyl phenol, which comprises the following steps: a) evaporating to remove most of phenol in the industrial nonyl phenol; obtaining evaporator bottom material; b) distilling to remove phenol; obtaining rough nonyl phenol; setting the temperature of feed material into distill tower at 70-120 deg.c and tower top temperature at 40-85 deg.c and tower autoclave temperature at 170-215 deg.c; setting the total fill pressure at 0.4-1.0Kpa; controlling the reflux rate R between 0.5 and 2; obtaining the theoretical tower boards at 6-30 blocks; c) rectifying the rough nonyl phenol to obtain refined nonyl phenol and rough dinonyl phenol; setting the feed temperature of rectifying tower at 90-130 deg.c and tower top temperature at 80-170 deg.c and tower autoclave temperature at 180-260 deg.c; setting the total fill pressure at 0.4-1.0Kpa; controlling the reflux rate R between 0.4 and 2.5; obtaining the theoretical tower boards at 4-28 blocks.

Description

Technical field [0001] The invention relates to a refining process for industrial nonylphenol, in particular to a refining process for industrial nonylphenol synthesized from nonene and phenol under the action of a catalyst. Background technique [0002] Industrial nonylphenol is a combination of nonene and phenol under the action of a catalyst, but due to various reasons, industrial nonylphenol products are easy to oxidize and change color during storage or during the production of downstream products. Sometimes this discoloration process is very rapid, directly affecting the sales and use of nonylphenol. If the domestic nonylphenol product is placed at room temperature for 12 days, the color can change from 47Hazen to 500Hazen or more. The laboratory research of Shanghai Petrochemical Research Institute found that when the purity of nonylphenol is high, the phenol content is low, and the product purity is high, the color is low and the color stability is good. The decrease in c...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: a) high residual phenol content in nonylphenol product; b recycled phenol contains nonylphenol; c) high nonylphenol content in kettle raffinate

(2) Technology of Hüels Company: It can be seen from Figure 2 that in the recovery process, low-carbon hydrocarbons are firstly distilled out for recovery, and the effluent from the tower bottom is evaporated through the evaporation tower to remove most of the phenol, and the removed phenol is returned to the nonylphenol synthesis system Circulation, the effluent from the bottom of the tower enters the rectification tower, the product nonylphenol is distilled from the top of the tower, dinonylphenol is separated as a side line, and returned to the nonylphenol synthesis device, so dinonylphenol has poor purity and cannot be used as a special The product of , can only be used for transalkylation

Dinonylphenol is not well recycled

The disadvantages of the process are: a. The separation requirements of the dephenolization tower are too high, and it is difficult to take into account the separation requirements of the tower top and tower bottom materials; b. The separation requirements of the nonylphenol rectification tower are too high. In order to ensure the quality of nonylphenol products, the bottom materials high in nonylphenol

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