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Degreasing method of crude montan wax

A technology of montan wax and production method, which is applied in the fields of coal chemical industry and fine chemical industry, can solve the problems of high solvent toxicity, difficult filtration and washing of materials, adhesion, etc. Effect

Inactive Publication Date: 2013-05-01
云天化集团有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The benzene solvent cooling crystallization method has the advantages of simple process and high yield; but it has the problems of high solvent toxicity and difficult filtration and washing of materials due to the partial crystallization in colloidal form
The cold benzene leaching method is relatively easy for solid-liquid separation, but it has the problems of high solvent toxicity and the need to crush the raw materials into fine particles in advance, and the raw materials are prone to softening and sticking when crushing
Ethyl acetate room temperature leaching method has a simple process and low toxicity, but its single-pass extraction efficiency is low, the extraction time is long, and repeated extractions are required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A. Add 1,000 grams of crude montan wax containing 27.86% resin and 4,000 grams of industrial grade ethyl acetate to the extraction reactor, heat to 72° C., and extract for 3 hours while stirring.

[0017] B. Cool the material to room temperature, and continue to stir for 0.5 hours at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled to recover ethyl acetate to obtain the resin product, and the filter cake is put into the extraction reactor again for secondary extraction.

[0018] C. Add filter cake and 3000 grams of technical grade ethyl acetate to the extraction reactor, heat to 72° C., and extract for 3 hours while stirring.

[0019] D. Cool the material to room temperature and continue to stir for 0.5 hour at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled t...

Embodiment 2

[0021] A. Add 1000 grams of crude montan wax containing 27.86% resin and 3000 grams of technical grade butyl acetate in the extraction reactor, heat to 100 ° C, and extract for 3 hours under stirring.

[0022] B. Cool the material to room temperature, and continue to stir for 0.5 hours at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled to recover butyl acetate to obtain the resin product, and the filter cake is put into the extraction reactor again for secondary extraction.

[0023] C. Add filter cake and 2200 grams of technical grade ethyl acetate into the extraction reactor, heat to 100° C., and extract for 3 hours while stirring.

[0024] D. Cool the material to room temperature and continue to stir for 0.5 hour at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled ...

Embodiment 3

[0026] A. Add 800 grams of crude montan wax containing 27.86% resin and 3000 grams of technical grade butyl acetate into the extraction reactor, heat to 80 ° C, and extract for 3 hours under stirring.

[0027] B. Cool the material to room temperature, and continue to stir for 0.5 hours at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled to recover butyl acetate to obtain the resin product, and the filter cake is put into the extraction reactor again for secondary extraction.

[0028] C. Add filter cake and 2000 g of technical grade butyl acetate into the extraction reactor, heat to 80° C., and extract for 3 hours while stirring.

[0029] D. Cool the material to room temperature and continue to stir for 0.5 hour at room temperature. The solid-liquid separation is then carried out by means of pressure filtration. The resin-containing liquid phase is distilled to re...

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PUM

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Abstract

The invention relates to a refining method of montan wax, and belongs to the technical field of the coal chemical engineering and the fine chemical engineering. The method for producing degreased montan wax by extracting resin impurities from crude montan wax treated as a raw material through a small-molecular-weight ester solvent sequentially comprises the following steps: 1, adding the crude montan wax and the small-molecular-weight ester solvent to a reactor according to a solid-liquid ratio of 1:3-6, and carrying out primary extraction at 70-125DEG C under a stirring condition for 2-4h; 2, cooling extracts obtained in step 1 to room temperature, and carrying out filtering separation to obtain a degreased filter cake and a resin-containing filtrate; 3, adding the degreased filter cake to the small-molecular-weight ester solvent, and carrying out secondary extraction at 70-125DEG C under a stirring condition to obtain a degreased filter cake and a resin-containing filtrate; and 4, carrying out normal or reduced pressure distillation of the degreased filtrate obtained in step 3 to recover the solvent and obtain the degreased montan wax, wherein a montan resin is a byproduct. The method has the advantages of small solvent application amount and reasonable technology.

Description

technical field [0001] The invention relates to a method for refining montan wax, which belongs to the technical fields of coal chemical industry and fine chemical industry. technical background [0002] Crude montan wax generally contains more resin impurities, and the resin content of domestic crude montan wax is generally 20-30%. High levels of resin can make chemical products containing this crude wax sticky, preventing its use in many wax-using industries. In addition, in the process of developing various processed waxes and refined waxes based on montan wax, resin is also a harmful impurity that needs to be removed in advance. [0003] Regarding the degreasing method of crude montan wax, the earliest methods are superheated steam vacuum distillation and oxidation decomposition. At present, more researches and industrial applications are solvent extraction methods, such as benzene solvent cooling crystallization method, cold benzene leaching method, ethyl ac...

Claims

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Application Information

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IPC IPC(8): C10G73/00C09F1/02
Inventor 王志刚
Owner 云天化集团有限责任公司
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