Method for processing low-temperature pyrolyzed coal tar

A technology of low-temperature coal tar and processing method, which is applied in the processing of tar, the processing of removing tar by water, and the processing of refining tar by chemical method, etc., can solve problems such as comprehensive utilization and waste of resources, achieve reasonable utilization, low cost, and solve The effect of difficult separation of oil and water
CN101974345AInactive Publication Date: 2011-02-16CHINA COAL RES INST
9 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA COAL RES INST
Publication Date
2011-02-16
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to a method for processing low-temperature pyrolyzed coal tar. The method comprises the following steps of: pressurizing and standing low-temperature coal tar to be pyrolyzed, dehydrating initially by changing surface tension, adding a demulsifying agent to form azeotropic water through light oil circulation and performing final dehydration; extracting crude phenate from the dehydrated low-temperature coal tar by alkaline washing; purifying the extracted crude phenate through oil-water mixed gas and decomposing through carbon dioxide so as to obtain crude phenol; and dehydrating the obtained crude phenol, deslagging and rectifying so as to obtain a target product. By the method, the phenol extraction rate of the low-temperature pyrolyzed coal tar is over 95 percent, the problem of difficult oil and water separation can be solved and the dehydration rate after processing is between 0.5 and 1 percent. The method is a processing method which has low cost and reasonably utilizes a low-temperature coal tar resource.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a low-temperature pyrolysis coal tar processing method, in particular to a low-temperature pyrolysis coal tar processing method in which phenol is first extracted and then distilled. Background technique

[0002] According to the different pyrolysis temperature, coal tar can be divided into low-temperature coal tar and high-temperature coal tar. With the massive development of low-rank coal with abundant reserves in my country, the reasonable separation and processing of low-temperature coal tar has become an important issue in the field of pyrolysis coal tar.

[0003] Due to the low pyrolysis temperature and a small amount of secondary pyrolysis, the composition characteristics and processing methods of low-temperature coal tar are obviously different from those of high-temperature coal tar. The content of phenolic compounds and saturated hydrocarbons is also higher than that of high-temperature coal tar, while the content of a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More