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Novel separation purification method for p-benzene dicarboxylic acid

A technology of terephthalic acid and filter, which is applied in the field of separation and purification of terephthalic acid, can solve problems such as difficulty in sealing and disassembly and maintenance, loss of pressure, complex system, etc., and achieve product quality assurance, less sealing surface, and wear parts little effect

Active Publication Date: 2008-12-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When a rotary vacuum filter is used for separation and purification, since the filtrate, gas, and washing liquid in the equipment need to be drawn out in a two-phase state through the central tube, a certain pressure will be lost, and the vacuum degree cannot be greatly improved, so Filtration driving force is small, the output of the same filtration area is low
In addition, the pressure and temperature on both sides of the filter are different, the filter is easy to crystallize and block, the filter cleaning cycle is short, the vacuum pump consumes a lot of energy, and the system is complicated
[0005] When the one-step method uses a rotary pressure filter partitioned by sealing blocks, since the washing area is larger and the area of ​​the filter press area is reduced, the separation and purification ability is reduced, and more rotary pressure filters are required to complete the rated output. There is a risk that the filter cake is too thick and the p-TA is not washed clean
In another BirdYoung rotary pressure filter, because many parts pass through the pressure vessel, it is difficult to seal, disassemble and overhaul. At the same time, due to the large gas consumption, a circulating gas compressor needs to be installed

Method used

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  • Novel separation purification method for p-benzene dicarboxylic acid
  • Novel separation purification method for p-benzene dicarboxylic acid
  • Novel separation purification method for p-benzene dicarboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] As shown in Figures 2 and 3, the solid phase content from the fourth crystallizer is ~36.5%, the viscosity is ~0.7cp, the p-TA content is ~1330ppm, the average diameter of the p-TA particles is 110 ~ 120μm, and the pressure The CTA slurry with a temperature of 0.35 MPaG and a temperature of about 148° C. is pressurized to 0.55 MPaG with a pump, and then fed to the filter press zone of the high-bar shell (HBF) rotary pressure filter 200. The pressure drop on both sides of the filter cloth in the filter press zone is maintained at about 0.12 MPa. A filter cake with a thickness of ~50mm is gradually formed in the filter press zone, and the filtrate enters the filtrate tank 219 with the same temperature and pressure as the fourth crystallizer through the conduit, and sends the filtrate to the PTA mother liquor recovery system under liquid level control.

[0042] When the drum rotates to the washing zone, the filter cake is subjected to two countercurrent backwashing with demine...

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Abstract

The invention discloses a method for separating and purifying a terephthalic acid with Cuban shell type rotary drum filters. The invention also discloses a method for separating and purifying a terephthalic acid with one Cuban shell type rotary drum filter. The invention also a method for separating and purifying a terephthalic acid with a Cuban shell type rotary drum filter together with one or a plurality of a sedimentation type centrifuge, a rotary vacuum filter, a rotary pressure filter, etc.

Description

Technical field [0001] The invention relates to a method for separation and purification of compounds, in particular to a method for separation and purification of terephthalic acid. Background technique [0002] Purified terephthalic acid (PTA) is one of the important raw materials for the production of polyester (PET). With the rapid development of the PET industry, the demand for PTA has also increased rapidly. At present, the commonly used production method of terephthalic acid (TA) is to oxidize and crystallize p-xylene to prepare crude terephthalic acid (CTA) with a large amount of impurities, and then dissolve the CTA in water under high temperature and high pressure. Hydrorefining is carried out under the action of a catalyst to dissolve impurities that were originally insoluble in water, and then the slurry is subjected to cooling and pressure crystallization and separation and purification to obtain the final purified terephthalic acid (PTA). [0003] The existing metho...

Claims

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Application Information

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IPC IPC(8): C07C63/26C07C51/42
Inventor 罗文德周华堂姚瑞奎张莼陈燕玲李利军汪英枝谢祥志
Owner BC P INC CHINA NAT PETROLEUM CORP
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