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Method for filtering and recovering solid particles in mother solution at PTA oxidation stage and filter using method

A solid particle, oxidation stage technology, applied in fixed filter element filters, chemical instruments and methods, filtration and separation, etc., can solve the problems of many process links, high operating costs, cumbersome and other problems, so as to solve the problem of poor filtration effect and save money. cost effect

Inactive Publication Date: 2016-07-20
DALIAN CATHAY PETROCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has many process links and high operating costs, and it needs to input mechanical energy (high-speed centrifugation) or heat energy (evaporation, drying) to remove liquid, which is very cumbersome

Method used

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  • Method for filtering and recovering solid particles in mother solution at PTA oxidation stage and filter using method

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so as to help understand the content of the present invention.

[0047] like figure 1 As shown, the present invention provides a system for filtering and recovering solid particles in the mother liquor of the PTA oxidation stage, including a filter 1, a feed unit, an alkali washing solution supply unit, a gas supply unit, a buffer tank and a drying unit. The alkaline cleaning solution supply unit includes an alkaline solution unit and a cleaning solution unit that share a set of pipelines connected to the filter, so as to facilitate alkaline cleaning of the equipment after a certain working period. The filter includes an inner cavity 101, a tube plate 102 and a filter element 103; the tube plate is arranged in the inner cavity and divides the inner cavity into two parts; the filter element is fixedly installed on the tube plate; There are also r...

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Abstract

The invention discloses a method for filtering and recovering solid particles in a mother solution at a PTA (Purified Terephthalic Acid) oxidation stage and a filter using the method. The method for filtering and recovering the solid particles in the mother solution at the PTA oxidation stage comprises the following steps: Step a: filtering the mother solution, and accumulating the solid particles in the mother solution to form a filter cake; Step b: separating the filter cake from the mother solution; Step c: carrying out drying treatment on the filter cake, wherein when the filter cake is separated from the mother solution in Step b, a gas is introduced to guarantee a pressure difference between the two sides of a filter element for making the filter cake adhered to the surface of the filter element; a filtering medium used for filtering the mother solution in Step a comprises the filter element. After the technical scheme is adopted, the technical processes of concentration and solid-liquid separation are completed once while the additional value of a PTA device is increased; a conventional technique of pulping and separation is replaced; the technique is simplified; the equipment investment and the running cost are decreased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for filtering and recovering solid particles in mother liquid in the oxidation stage of PTA and a filter using the method. Background technique [0002] The production of PTA (purified terephthalic acid) is generally based on PX (p-xylene) as raw material, with metal cobalt and manganese ions as catalyst, hydrobromic acid as cocatalyst, acetic acid as solvent, under certain temperature and pressure, Utilize oxygen in the air to oxidize terephthalic acid, then crystallize, separate, and dry to obtain CTA (crude terephthalic acid), which can be obtained by hydrogenation reaction, crystallization, separation, and drying Purified terephthalic acid (PTA). [0003] In the process of producing crude terephthalic acid (CTA) by oxidation of p-xylene (PX), a certain amount of oxidation mother liquor will be formed, which contains o-, m-, terephthalic acid, benzoic acid, p-toluic ...

Claims

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Application Information

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IPC IPC(8): B01D37/00B01D37/04B01D29/11B01D29/66B01D29/90B01D29/92B01D29/94B01D29/60
CPCB01D37/00B01D29/11B01D29/60B01D29/66B01D29/90B01D29/92B01D29/94B01D37/046
Inventor 王甦王新剑陈晓文于春健刘霁斌
Owner DALIAN CATHAY PETROCHEM TECH
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