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Waste liquid separating process for tetrahydromethyl phthalic anhydride production process

A technology of methyltetrahydrophthalic anhydride and production process, applied in the field of separation of waste liquid in the production process of methyltetrahydrophthalic anhydride, and can solve problems such as low value

Active Publication Date: 2006-05-17
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, this MTHPA production waste liquid is usually only used for low-value use, such as fuel and solvent, etc.

Method used

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  • Waste liquid separating process for tetrahydromethyl phthalic anhydride production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0029] The methyltetrahydrophthalic anhydride production waste liquid whose composition is shown in Table 1 enters a rectification tower for rectification to remove light components. The rectification tower is a packed tower with a theoretical plate number of 60, and the feed port is located at the 30th block. Plate, each embodiment rectification operation condition sees Table 2. The light component material was distilled from the top of the tower, and the material composition obtained in the tower kettle of each embodiment is shown in Table 3.

[0030] Reflux ratio

[0031]

Embodiment 5～10

[0033] The composition is as shown in Table 3. The material obtained in the tower kettle of Example 1 is preheated to 40-50° C. and then enters an extractive distillation tower for extractive distillation. The extractive distillation tower is a packed tower with 45 theoretical plates. The material enters the extractive distillation column from the 32nd tray at a speed of 400g / h, and the extractant is fed from the 4th tray. The extractive distillation column is operated under normal pressure, and the specific extraction agent used in each embodiment and other operating conditions are shown in Table 4. The main composition of the material discharged from the top of the extractive distillation tower is shown in Table 5, which is a mixed carbon five mainly composed of cyclopentene and cyclopentane.

[0034]

[0035] Note: DMF is dimethylformamide; the water content of acetonitrile aqueous solution is 10wt%.

[0036] Cyclopentene

[0037] The extractive d...

Embodiment 11～14

[0041] The tower top material (composition sees Table 5) that obtains by process 2 embodiment 5 enters in a rectification tower and carries out rectification, and rectification tower is a packed tower, and the number of theoretical plates is 50, and feed opening is positioned at the 28th plate, The rectifying towers of each embodiment are operated under normal pressure, and other process conditions are shown in Table 8, and the product composition of the tower top and tower bottom is shown in Table 9 and Table 10 respectively.

[0042] Tower bottom / top temperature (°C)

[0043] trans-pentadiene

[0044] trans-pentadiene

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Abstract

The process of separating waste liquid from the tetrahydromethyl phthalic anhydride producing process includes the following steps: 1. rectifying waste liquid to eliminate light components; 2. extracting and rectifying the cauldron material of the step 1 with the extractant dimethyl formamide, N-mehtyl pyrrolidone, acetonitrile or water solution of acetonitrile with water content of 5-15 wt%; 3. rectifying the cauldron material of the step 2 to separate and recover extractant in the cauldron for reuse while obtaining cis-piperyene product; and 4. rectifying the tower top material of the step 2 to obtain cyclopentene in the tower top and cyclopentane in the cauldron. The present invention provides one ideal separating process to obtain fine chemical products with high latent value.

Description

technical field [0001] The invention relates to a method for separating waste liquid in the production process of methyltetrahydrophthalic anhydride. The waste liquid is produced by the reaction of mixed carbon five and maleic anhydride after separation and removal of dicyclopentadiene from the by-product carbon five fraction of ethylene cracking. The production process of tetrahydrophthalic anhydride. Background technique [0002] Methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride are the most commonly used curing agents for epoxy resins. Methyltetrahydrophthalic anhydride can be prepared by reacting the mixed C5 (hereinafter referred to as C5) after separation and removal of dicyclopentadiene from petroleum C5 fractions and maleic anhydride. Methyl tetrahydrophthalic anhydride can be produced by further hydrogenation of methyl hexahydrophthalic anhydride. [0003] In addition to the reaction of ring carbon five raw materials and maleic anhydride to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00B01D11/04C02F1/26
Inventor 傅建松王雅辉张冬梅吴忠平蒋方红
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD