Integral process for washing and filtering terephthalic acid and water recovery

A technology of terephthalic acid and washing water, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of long process flow, many redundant operations, increased load of centrifuges, etc., to improve the quality of washing , High operability, the effect of reducing consumption

Inactive Publication Date: 2012-03-21
TIANHUA INST OF CHEM MACHINERY & AUTOMATION +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] ① Long process flow and many redundant operations
[0004] The "filtration, washing, and pre-drying" of the terephthalic acid suspension are completed in three equipments: "pressure centrifuge, washing tank, and centrifuge", and auxiliary equipment such as transfer pumps and matching pipelines are required between the equipment , pipe fittings, valves, etc., the control process is long, and there are many redundant operations, which is prone to filtrate leakage, which is harmful to personal safety and corrosive to equipment and plant floors.
[0005] ②The equipment is bulky and consumes a lot of energy
Since the washing is operated under normal pressure, the equipment volume of the primary washing tank and the second

Method used

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  • Integral process for washing and filtering terephthalic acid and water recovery

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Embodiment Construction

[0025] Attached below figure 1 The process flow of the "filtration and washing" process of terephthalic acid (PTA) suspension and the process of "water recovery after filtration and washing" are as follows:

[0026] A terephthalic acid (PTA) washing filtration and water recovery integrated process, its step is carried out in two steps:

[0027] ① "Filtration and washing" of PTA suspension

[0028] The PTA suspension from the PTA slurry tank 1 with a temperature of 100-150°C and a pressure of 0.3-0.5MPa(G) is pressurized by the PTA slurry pump 2 and enters the filter unit of the pressure filter 3. The pressure filter 3 uses frequency conversion The way of speed regulation is to do centripetal rotation. The annular area between the drum and the shell is sealed by packing, and is divided into different airtight cavities by spacers, and 0.4-0.6MPa(G) nitrogen gas is introduced into the airtight cavities to make the pressure filter 3 in a pressurized state . The filtrate tube o...

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Abstract

The invention discloses an integral process for washing and filtering terephthalic acid and water recovery, comprising the steps of: pumping a PTA suspension from a PTA slurry tank by a pressure filter to a filter unit chamber with a surface filtrate tube of a rotary drum connected with a control joint; after filtering, collecting the mother liquid in a mother liquid collecting tank; then overflowing in high position to a mother liquid flash drum in which 0.008-0.020MPa (A) vacuum is generated; generating clean steam at 5-60 DEG C by flashing the mother liquid, and at the same time generating 0.008-0.20MPa (A) vacuum in an air cooler so that the clean steam at 5-60 DEG C is condensed to clean water in the air cooler. The recycled clean water can be used as primary and secondary washing water of the pressure filter so as to save water and reduce consumption.

Description

technical field [0001] The invention relates to a "filtering and washing" process of terephthalic acid (PTA) suspension and a "water recovery after filtering and washing" process. Background technique [0002] In the oxidation unit and refining unit of the existing terephthalic acid industrial plant, the three processes of "filtration, washing and pre-drying" of the terephthalic acid (PTA) suspension adopt the traditional "centrifuge filtration, tank washing, Vacuum centrifuge filtration" process technology, the disadvantages of this process technology are: [0003] ① Long process flow and many redundant operations [0004] The "filtration, washing, and pre-drying" of the terephthalic acid suspension are completed in three equipments: "pressure centrifuge, washing tank, and centrifuge", and auxiliary equipment such as transfer pumps and matching pipelines are required between the equipment , pipe fittings, valves, etc., the control process is long, and there are many redun...

Claims

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Application Information

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IPC IPC(8): C07C63/26C07C51/42
Inventor 张麦奎赵旭张万尧申涛
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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