Efficient separation recycling method for solid particles of terephthalic acid oxidized mother liquor

A technology of terephthalic acid and solid particles, which is applied in chemical instruments and methods, semi-permeable membrane separation, and sediment separation by centrifugal force, etc., can solve the hidden dangers of increasing the workload of equipment maintenance personnel, high concentration of overflow particles and stable operation. and other problems, to achieve the effect of good corrosion resistance, low operating cost and easy maintenance

Inactive Publication Date: 2015-06-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the fine solid particles in the system, the separation efficiency is low, and the overflow particle concentration is high, the physical properties determine the instability of the system
The centrifuge is easy to block, which brings hidden dangers to the stable operation of production. On the one hand, it increases the consumption of production, and on the other hand, it increases the workload of equipment maintenance personnel.

Method used

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  • Efficient separation recycling method for solid particles of terephthalic acid oxidized mother liquor

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specific Embodiment approach

[0032] General idea of ​​the present invention is:

[0033] A method for efficiently separating and recovering solid particles of terephthalic acid oxidation mother liquor, the specific steps are:

[0034] (1) The mother liquor output from the oxidation mother liquor pump enters the solid-liquid cyclone separator, the oxidation mother liquor from the upper end of the micro cyclone separator enters the mother liquor buffer tank, and the solid phase particle concentrate rich in larger particle sizes is separated at the lower end to go Recycled storage tanks;

[0035] (2) The material in the mother liquor buffer tank is pumped into a high-efficiency metal porous membrane tube filter for filtration and separation; under the action of pressure, the mother liquor passes through the filter element, and the filtrate goes to the distillation tower for mother liquor recovery; terephthalic acid or catalyst solid particles are intercepted A filter cake is formed on the outer surface of t...

Embodiment 1

[0043] TA mother liquor filtration

[0044] The TA oxidation mother liquor enters the liquid-solid micro cyclone separator E1 through the control valve V1, the oxidation mother liquor from the upper end of the micro cyclone separator E1 enters the mother liquor buffer tank E2 through the control valve V3, and the solids rich in larger particle sizes are separated at the lower end. The concentrated liquid of phase particles goes to the recovery material storage tank E4 through V2; the mother liquid in the mother liquid buffer tank E2 enters the metal porous material filter E3, and the mother liquid passes through the filter element and the filtrate goes to the distillation tower through the control valve V14 for mother liquid recovery; TA solid particles are retained A filter cake forms on the outer surface of the filter element.

Embodiment 2

[0046] Metal Porous Material Filter Backflush

[0047] When the pressure difference between the inlet and outlet of the metal porous material filter E3 reaches the set value, the filter stops feeding. The backflush nitrogen control valve V12 is opened, and the filtrate in the filter E3 casing flows reversely quickly, pushing the filter cake to leave the filter element and return to the recycled material storage tank E4 through the control valve V5, and the backflush is completed. The material in the recycled material storage tank E4 is sent to the batching unit through the control valve V8 after beating.

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Abstract

The invention relates to an efficient separation recycling method for solid particles of terephthalic acid oxidized mother liquor. The method comprises the following steps of: (1) initially separating the terephthalic acid oxidized mother liquor by using a solid-liquid micro-cyclone separator to obtain solid particles with large diameter size; (2) filtering and separating the oxidized mother liquor that is initially separated by the solid-liquid micro-cyclone separator by using a corrosion-resisting efficient metal porous membrane tube; and (3) putting the filtered clear liquid into a distillation column to recycle a solvent, pulping the solid particles in a recycled material storage tank and then putting the pulped solid particles in a material distribution unit for utilization. According to the method disclosed by the invention, the solid and liquid separation efficiency is improved, the post treatment of the oxidized mother liquor in the production process of the terephthalic acid is reduced, efficient recycle of fine solid particles in the oxidized mother liquor can be realized, and the production cost is reduced.

Description

【Technical field】 [0001] The invention relates to solid-liquid separation and recovery technology, in particular to a method for efficient separation and recovery of solid particles of terephthalic acid oxidation mother liquor. 【Background technique】 [0002] In the production process of purified terephthalic acid (PTA), the oxidation mother liquor and refined mother liquor are rich in terephthalic acid (TA) and other organic matter and cobalt-manganese catalysts. Extensive treatment process will waste a lot of TA and other organic matter. Recovery of solid particles (TA, catalyst, etc.) in the mother liquor is an important factor to reduce the production cost of PTA. The recycling and comprehensive utilization of PTA catalyst can not only greatly save resources and reduce costs, but also improve the environmental pollution. [0003] For example, the Amoco process, in this process, the mother liquor produced by the PTA oxidation reaction is directly heated and recovered wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D21/26B01D63/06C22C1/08
Inventor 刘京雷徐宏吴勇王建平任衍伦沈远陶振宇万顺梁涛
Owner EAST CHINA UNIV OF SCI & TECH
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