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Paracresol separation method

A separation method, the technology of p-cresol, applied in the field of separation, can solve the problems of complex process, complicated separation process, and large solvent consumption, and achieve the effect of simple process, simple operation, and avoiding a large amount of solvent consumption

Active Publication Date: 2019-01-18
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of separation method of p-cresol, to solve the problems of complex technological process, large solvent consumption, large energy consumption and complicated separation process in the prior art

Method used

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Examples

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Embodiment 1

[0036] A mixture with 60% p-cresol from coal liquefied oil was used as a mixed mother liquor. Add the mixed mother liquor to the reaction kettle with cold trap and stirring; turn on the stirring and low-temperature cold trap, and lower the cold trap to 10°C, add p-cresol crystals as seed crystals, the seed crystal size is 200 mesh, and make the mixed mother liquor in Crystallize in the reaction kettle for 120 minutes to generate p-cresol crystalline products; in a cold trap at a temperature of 20°C, suction-filter the mixed mother liquor containing the crystalline products, and quickly transfer the obtained crystalline products. The analysis results of p-cresol purity and yield are shown in Table 1.

Embodiment 2

[0038] A mixture with 60% p-cresol from coal tar was used as a mixed mother liquor. Add the mixed mother liquor into the reaction kettle with cold trap and stirring; turn on the stirring and low-temperature cold trap, and lower the cold trap to 12°C, and stir for 180 minutes; add p-cresol crystals as seed crystals, the seed crystal size is 200 mesh, Stir and crystallize, and react for a period of time to generate p-cresol crystalline products; in a cold trap at a temperature of 20°C, suction-filter the mixed mother liquor containing the crystalline products, and quickly transfer the obtained crystalline products. The analysis results of p-cresol purity and yield are shown in Table 1.

Embodiment 3

[0040] A mixture with 60% p-cresol of crude phenol oil from mixed phenols was used as a mixed mother liquor. Add the mixed mother liquor to the reaction kettle with cold trap and stirring; turn on the stirring and low-temperature cold trap, and lower the cold trap to 14°C, add p-cresol crystals as seed crystals, the seed crystal size is 200 mesh, and make the mixed mother liquor in Crystallize in the reaction kettle for 180 minutes to generate p-cresol crystalline products; in a cold trap at a temperature of 20°C, suction-filter the mixed mother liquor containing the crystalline products, and quickly transfer the obtained crystalline products. The analysis results of p-cresol purity and yield are shown in Table 1.

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Abstract

The invention provides a paracresol separation method. The method comprises the following steps of S1, providing a mixture containing 60 to 90 weight percent of paracresol; S2, adding paracresol seedcrystals into the mixture at 10 to 36 DEG C so that paracresol is crystallized; separating out paracresol crystals; S3, separating the paracresol crystals. By using the technical scheme provided by the invention, the operation is simple; the operation temperature and the operation pressure of the technical process are lower; the equipment and operation cost is reduced. Meanwhile, by using the technical scheme, higher crystallizing temperature and shorter cooling time are used; the energy consumption reduction is facilitated. In addition, by using the technical scheme, the simple technical process is used; the use of a great number of solvents is not needed, so that the problem of complicated separation process and great consumption of solvents can be avoided.

Description

technical field [0001] The present invention relates to a kind of separation method, specifically, relate to a kind of separation method of p-cresol. Background technique [0002] Coal liquefied oil (coal tar) contains a wide variety of phenolic compounds and is an important source of chemical raw materials and intermediates. m-cresol and p-cresol are valuable raw materials in chemical industries such as pesticides, medicines, fuels, spices, fibers, and engineering plastics. Cresol extracted from coal liquefied oil (coal tar) is a mixture of o-cresol, m-cresol and p-cresol. Due to their different physical and chemical properties, when the mixture is directly used, the economic value extremely low. [0003] o-cresol has a lower boiling point, so it can be directly separated from the cresol mixture through the rectification process; the difference between the boiling point of m-cresol and p-cresol is only 0.3°C, so it is difficult to separate them by traditional rectificatio...

Claims

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Application Information

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IPC IPC(8): C07C37/68C07C37/70C07C37/74C07C37/84C07C37/86C07C39/07
CPCC07C37/005C07C37/007C07C37/685C07C37/74C07C37/84C07C37/86C07C39/07
Inventor 周升舒歌平章序文杨葛灵王洪学高山松
Owner CHNA ENERGY INVESTMENT CORP LTD
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