Recycling method for phthalic anhydride residues

A technology of residue and phthalic anhydride, which is applied in the field of recycling and utilization of phthalic anhydride residue to achieve high recovery rate and reduce emissions

Inactive Publication Date: 2014-07-09
辽宁东野环保产业开发有限公司
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Problems solved by technology

The method solves the technical problem of recovering di

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  • Recycling method for phthalic anhydride residues

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[0012] In the following, the present invention will be further described in conjunction with the embodiments:

[0013] Such as figure 1 Shown:

[0014] The specific steps for recovering di-n-butyl phthalate from phthalic anhydride residue are as follows:

[0015] 1) Grinding and screening of phthalic anhydride residue: After being milled by ball mill 1, the phthalic anhydride residue is put into ball grinding tank 2. The powder of the ball mill is lifted to rotary vibrating screen 4 by elevator 3 for sieving. The particle size of phthalic anhydride residue is l~5mm;

[0016] 2) Esterification: Under stirring, 74 grams of phthalic anhydride residue powder and 155 grams of n-butanol are added to the esterification reactor 7 for esterification, and the n-butanol is passed from the n-butanol storage tank 5 through the n-butanol feeding pump 6 Put into the esterification reactor 7, and at the same time add 2.22 grams of catalyst sulfuric acid to the esterification reactor, the esterifica...

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Abstract

The invention provides a recycling method for phthalic anhydride residues. The method comprises the steps of: phthalic anhydride residue grinding; sieving; esterifying; crude dibutyl phthalate neutralizing and cleaning; distilling. By using the method provided by the invention, di-n-butyl phthalate can be prepared from phthalic anhydride residues, so that the aims of utilizing wastes, reducing emission, protecting environments, saving, increasing efficiency and reducing expenditure are achieved. The recycling method is suitable for being applied as a method for recycling di-n-butyl phthalate from the phthalic anhydride residues.

Description

technical field [0001] The invention relates to a method for recycling phthalic anhydride residues. Background technique [0002] Phthalic anhydride residue is the phthalic anhydride residue that is discharged from the rectification process produced by the naphthalene oxidation method or the o-xylene oxidation method and contains a large amount of phthalic anhydride high boiling matter or is mixed with various foreign matters such as soil, sand, etc. 5% of the output of phthalic anhydride, and the domestic annual output is about 4,000 tons. Regarding the recycling of phthalic anhydride residues, the incineration method is mainly used abroad. Domestically, the direct sublimation method or recrystallization method is mainly used to recover the phthalic anhydride in the phthalic anhydride slag. Due to its oxidative decomposition at high temperature, the phthalic anhydride sublimates and becomes colored, the recovery rate is low (generally 70%), and the production is safe. How...

Claims

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Application Information

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IPC IPC(8): C07C69/80C07C67/08
CPCC07C67/08C07C69/80
Inventor 李宇增谭攸庚李晓杰
Owner 辽宁东野环保产业开发有限公司
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