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Method for improving quality of phenol product

A technology for product quality and phenol, applied in the field of phenol post-processing, can solve the problems of ineffectiveness, affecting the treatment efficiency of 2-methylbenzofuran, short resin bed residence time, etc., to ensure the removal effect, improve the quality of phenol products, remove full effect

Inactive Publication Date: 2020-12-15
于广臣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (3) The residence time of the resin bed is short. If hydroxyacetone exists in the phenol stream, it will affect the treatment efficiency of 2-methylbenzofuran, or even be invalid.

Method used

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  • Method for improving quality of phenol product
  • Method for improving quality of phenol product
  • Method for improving quality of phenol product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] refer to figure 1 , a kind of method that the present invention promotes phenol product quality, comprises the following steps:

[0035] Step 1. When the cumene method is used to produce phenol acetone, the crude phenol coming out of the bottom of the crude acetone tower is pumped to the cumene topping tower through the bottom pump, and the bottom liquid of the cumene topping tower is injected into the pump by chemicals. Add methylpentylenediamine to the chemical processor, and then pump the bottom liquid from the bottom of the cumene topping tower to the tar tower through the bottom pump;

[0036] Step 2, the tar tower overhead material is cooled by the tar tower cooling cooler and the tar tower cooler, enters the tar tower receiving tank, and then enters the α-methylstyrene (AMS) tower by the tar tower top pump; wherein, the The reflux flow rate at the top of the α-methylstyrene tower is controlled at 23m 3 / hour, the temperature at the top of the tower is controll...

Embodiment 2

[0044] A kind of method that promotes phenol product quality, and the difference of embodiment 1 is:

[0045] Step 2, the tar tower overhead material is cooled by the tar tower cooling cooler and the tar tower cooler, enters the tar tower receiving tank, and then enters the α-methylstyrene (AMS) tower by the tar tower top pump; wherein, the The reflux flow rate at the top of the α-methylstyrene tower is controlled at 20m 3 / hour, the temperature at the top of the tower is controlled at 138°C.

[0046] Phenol product testing:

[0047] Method: The crystallization point of phenol was determined (GB / T 339), and the moisture content of phenol products was determined by Karl Fischer method (refer to Allied V-17-FR).

[0048] Results: The crystallization point of phenol was 40.81°C, and the moisture content of phenol was 191PPm.

Embodiment 3

[0050] In order to solve the problem of phenol oxidation, ensure that the appearance of phenol products does not change color for a long time, and the crystallization point is greater than 40.8°C, five corrosion inhibitors with a crystallization point above 40.8°C are selected in this embodiment, and 0.5 grams of each corrosion inhibitor is used, respectively Add to 1000g phenol product and test, concrete test data such as table 1:

[0051] 24 hours test of phenol corrosion inhibitor

[0052]

[0053] 48 hours test of phenol corrosion inhibitor

[0054]

[0055] Phenol corrosion inhibitor 72 hours test

[0056]

[0057]

[0058] It can be seen from the above test results that adding 2-hydroxypropane-1,2,3-tricarboxylic acid (citric acid) to phenol can effectively keep the phenol product from discoloration for a long time, and the crystallization point is stable above 40.8°C. Therefore, by adding a corrosion inhibitor (citric acid, 500 grams per ton of phenol) to ...

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Abstract

The invention relates to a method for improving the quality of a phenol product. The method comprises the steps: enabling a resin bed to be designed into three wet-based resin beds which are connectedin series and contain resin Xfj-02D (T-311) and have the water content of 40-50%, wherein 2 tons of resin is filled in the first sub-resin bed and the second sub-resin bed, 4.5 tons of resin is filled in the third sub-resin bed, the inlet temperature of the sub-resin beds is controlled to be 90-110 DEG C, and the ratio of the phenol feeding amount to the dry resin amount on each sub-resin bed is3, so the removal effect of carbonyl impurities is ensured, and the impurities are completely removed; besides, in the rectification process, the temperature of a sensitive plate at the top of the AMStower is increased to 135-138 DEG C by reducing the reflux quantity of the top of the AMS tower, the water content in a phenol product is reduced to 200 PPm or below, and the crystallization point ofphenol reaches 40.8 DEG C or above; finally, a corrosion inhibitor (citric acid) is added into phenol, so the phenol product is effectively kept unchanged in color for a long time, and the quality ofthe phenol product is comprehensively improved.

Description

technical field [0001] The invention relates to the field of phenol post-treatment methods, in particular to a method for improving the quality of phenol products produced in a phenol and acetone production line combined through a cumene oxidation method. Background technique [0002] The existing phenol-acetone plant has been built since 1996, and the current production capacity of phenol has reached 120,000 tons per year. The industrial process from cumene to phenol is well known and involves a two-step synthesis: air oxidation of cumene to a cumene hydroperoxide (CHP) intermediate, followed by acid decomposition (cracking) of CHP to give phenol and acetone as main products. However, in addition to the desired product, the resulting crude cleavage product mixture also contains certain amounts of various by-products, including α-methylstyrene, acetophenone, cumylphenol, unreacted cumene, and traces of Amounts of various carbonyl-type impurities, including hydroxyacetone, ...

Claims

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Application Information

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IPC IPC(8): C07C39/04C07C37/68C07C37/82C07C37/88C07C37/86C07C37/74
CPCC07C37/685C07C37/74C07C37/82C07C37/86C07C37/88C07C39/04
Inventor 于广臣胡春福
Owner 于广臣
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