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Multistage suspension melting crystallization method for separating p-xylene

A suspension melting crystallization, p-xylene technology, applied in crystallization purification/separation, organic chemistry and other directions, can solve the problems of unstable operation of aging kettles and high production energy consumption, achieve the elimination of fine crystal recovery steps, reduce energy consumption, and ensure Yield effect

Inactive Publication Date: 2017-06-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 multi-stage suspension melting crystallization method for separating p-xylene is provided

Method used

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  • Multistage suspension melting crystallization method for separating p-xylene

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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 95% raw material 1, flow rate is 1075kg / h, after being cooled by mother liquor heat exchanger A and precooler B, be divided into two strands, a part of raw material 2 enters aging kettle C to pair two Toluene crystals 21 are subjected to beating, washing and heating aging at an operating temperature of 8°C. A part of the raw material 3 enters the primary crystallizer F for crystallization at a crystallization temperature of 3°C; the residence time of the crystal slurry 4 in the aging kettle C is 30 minutes, containing 30% p-xylene crystals, separated by solid-liquid separator D to obtain p-xylene crystals 5 and aging mother liquor 6, the aging mother liquor 6 is divided into two shares, and the first share of 60% by weight of the aging mother liquor 7 returns in the aging kettle C , the aging mothe...

Embodiment 2

[0029] The invention relates to a multistage suspension melting crystallization method for separating p-xylene. According to the operating conditions of Example 1, wherein the flow rate of raw material 3 entering the primary crystallizer is 430kg / h, the results are listed in Table 1.

Embodiment 3

[0031] The invention relates to a multistage suspension melting crystallization method for separating p-xylene. According to the operating conditions of Example 1, wherein the flow rate of raw material 3 into the primary crystallizer is 645kg / h, 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 product, 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 residual p-xylene product. Stable operation of the aging kettle is guaranteed by adjusting the amount and temperature of the raw materials entering into 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 multistage suspension melting crystallization method for separating p-xylene. [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 and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/14C07C15/08
Inventor 陈亮宗弘元张鸿翔郭艳姿
Owner CHINA PETROLEUM & CHEM CORP
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