Process method for separating and purifying cresol mixed isomers

A technology of isomers and cresols, applied in the field of chemical separation, can solve the problems of large amount of desorbent, high production cost, and high cost, and achieve the effects of simple operation steps, improved production efficiency, and low operating cost

Pending Publication Date: 2018-04-06
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the disadvantages of complex preparation of adsorbent, high cost, and the optimal process conditions are not clear
[0008] The adsorption separation method reported in the above patent literature requires many layers of adsorption towers to operate, not only the concentration and amount of feed are limited, but also the amount of desorbent used is large, the production cost is high, and only one product of p-cresol can be obtained.

Method used

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  • Process method for separating and purifying cresol mixed isomers
  • Process method for separating and purifying cresol mixed isomers
  • Process method for separating and purifying cresol mixed isomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 102kg water content 15wt% average particle diameter is 0.45 μ m silicon-aluminum molecular ratio is the X molecular sieve of 2.37, and 10.5kg kaolin (90.2wt% of kaolinite content) is binding agent, and deionized water is auxiliary agent (deionized water quality is solid 10.9wt% of the powder) is rolled into balls to obtain balls of 0.3-0.8 mm, dried at 120° C. for 24 hours, and calcined at 550° C. for 6 hours. The pellets were treated with 1.4 mol / L NaOH aqueous solution at a solid-to-liquid ratio of 1.6:1 at 95°C for 6 hours. Wash the pellets with deionized water until the pH value is 10, then dry them at 85°C for 24 hours, roast them at 550°C for 6 hours, and screen out pellets of 0.3-0.8 mm in size, then fluidize and dehydrate them at 240°C to control the water content of the adsorbent. 1.8wt%, the obtained adsorbent is recorded as I. Prepare a 3mL cylindrical cylinder, add 2.5mL of adsorbent sample into the cylinder, apply pressure at a strength of 200N, and count ...

Embodiment 2

[0042] The preparation process is the same as that of Example 1, except that rectorite is used as a binder to form a rolling ball, and the adsorbent II is obtained after post-treatment. The component contents and physical properties are shown in Table 1.

Embodiment 3

[0044] The preparation process is the same as in Example 1, and the adsorbent obtained in Example 1 is subjected to 0.5mol / L of KNO 3 Aqueous solution, at 95°C, 0.2MPa, exchange liquid volume space velocity 3.0h -1 K + exchanged for 20h, and then subjected to 0.18mol / L Ba(NO 3 ) 2 The aqueous solution was replaced under the same conditions for 24h, after the exchange K + 4.1% of total cationic sites, Ba 2+ Accounting for 95.5% of the total cationic sites, it is adsorbent III, and its component content and physical properties are shown in Table 1.

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Abstract

The invention discloses a process method for separating and purifying cresol mixed isomers. The process method is characterized by comprising the following steps: inputting a mixture primarily comprising m-cresol and p-cresol isomers into a sequential simulated moving bed as a feed to be adsorbed and separated, obtaining a high purity p-cresol solution from a displacing liquid port, and then rectifying, separating and removing a desorption solvent to obtain a m-cresol product; and obtaining a mixed solution primarily comprising m-cresol from a raffinate port, then rectifying, separating and removing the desorption solvent to obtain a mixture rich in m-cresol, and then carrying out crystallization and separation to obtain the m-cresol product. The sequential simulated moving bed disclosed by the invention at least contains four chromatographic columns, a raw material feed inlet, a strippant feed inlet, a strippant discharge port and a raffinate discharge port. The process method can obtain high purity m-cresol and p-cresol products continuously and efficiently at the same time, and has a very good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical separation and relates to a process for the separation and purification of cresol mixed isomer compounds, in particular to a method for obtaining high-purity cresol and m-cresol products through the separation and purification of an adsorption-crystallization combined process. Background technique [0002] There are three isomers of cresol, o-cresol, m-cresol, and p-cresol. Each monomer is an important fine chemical intermediate. O-cresol is mainly used in synthetic resins, herbicides, disinfectants, preservatives, plasticizers and spices. m-cresol can be used as an analytical reagent, and is also an important raw material for antioxidants, vitamin E, synthetic resins, and color film developers. P-cresol is the main raw material for the production of antioxidants, plasticizers, medical disinfectants, dyes, spices, curing agents, fluorescent whitening agents and other products. With the continuous develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/70C07C39/07
CPCC07C37/685C07C37/70C07C39/07
Inventor 李小龙王志光王涛刘太禄李进
Owner CHINA CATALYST HLDG CO LTD
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