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Method for separating p-xylene by multistage suspension melt crystallization

A suspension melt crystallization and p-xylene technology, which is applied in crystallization purification/separation, organic chemistry, climate sustainability, etc. It can solve the problems of unstable operation of aging kettles and high energy consumption in production, so as to ensure product purity and stable output , the effect of energy consumption reduction

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of unstable operation of the aging kettle and high production energy consumption existing in the existing p-xylene crystallization production, and a novel method for separating p-xylene by multi-stage suspension melting crystallization is provided

Method used

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  • Method for separating p-xylene by multistage suspension melt crystallization

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Embodiment 1

[0026] The invention relates to a multistage suspension melting crystallization method for separating p-xylene.

[0027] Such as figure 1 Said, containing p-xylene concentration is 82% raw material 1, flow rate is 1075kg / h, is divided into two strands after being cooled by mother liquor heat exchanger A and precooler B, a part of raw material 2, flow rate is 645kg / h, enters P-xylene crystals 13 and p-xylene crystals 18 are subjected to beating washing and heating aging in the aging kettle C. The operating temperature of the aging kettle is 5° C., and a part of the raw material 3 with a flow rate of 430 kg / h enters the primary crystallizer D for Crystallization, the operating temperature of the crystallizer is -3°C; the residence time of the crystal slurry 4 in the aging kettle is 30 minutes, containing 30% p-xylene crystals, and the p-xylene crystals 5 and the aging mother liquor are obtained after being separated by the solid-liquid separator E 6, the aging mother liquor 6 i...

Embodiment 2

[0029] The invention relates to a multistage suspension melting crystallization method for separating p-xylene.

[0030] According to the operating conditions of Example 1, wherein the flow rate of raw material 2 entering the aging tank is 430kg / h, the results are listed in Table 1.

Embodiment 3

[0032] The invention relates to a multistage suspension melting crystallization method for separating p-xylene.

[0033] According to the operating conditions of Example 1, wherein, the flow rate of raw material 2 entering the aging tank is 1075kg / h, and the results are listed in Table 1.

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Abstract

The invention relates to a multistage suspension melting crystallization method for separating p-xylene. The multistage suspension melting crystallization method comprises the following steps: carrying out shunt operation on raw materials, carrying out multistage crystallization on a part of the raw materials, directly obtaining a p-xylene crystal, then using the rest of the raw materials to carry out pulping washing and warming aging on a low-temperature crystal in an aging kettle, and obtaining a p-xylene product. Stable operation of the aging kettle is guaranteed by adjusting the amount and temperature of the raw materials entering the aging kettle, and then the stability of product purity and yield is guaranteed. Through the technical scheme adopted in the invention, the problems of unstable operation of the aging kettle and high energy consumption existing in the prior art are preferably solved, and the method can be used in the crystallization production of the p-xylene.

Description

technical field [0001] The invention relates to a method for separating p-xylene by multistage suspension melting crystallization. [0002] technical background [0003] Paraxylene (PX) is an important organic chemical raw material, mainly used as a raw material for the production of purified terephthalic acid (PTA) and dimethyl terephthalate (DMT), and PTA is used to produce polyethylene terephthalate Polyester products such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). In recent years, my country's polyester industry has continued to develop at a high speed. Although China has become the world's largest producer of PX, the domestic PX production capacity is far from meeting market demand, and a large amount of imports is required every year. In the next few years, my country's PX consumption will continue to maintain a good growth momentum, and the shortage of PX supply will always exist. Therefore, the current tasks of increasing PX production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/14C07C15/08
CPCC07C7/14C07C15/08Y02P20/10
Inventor 宗弘元陈亮张鸿翔郭艳姿
Owner CHINA PETROLEUM & CHEM CORP
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