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Modified coal tar, and producing method

A production method, the technology of coal tar pitch, applied in the field of modified coal pitch, can solve the problems of no coal tar pitch, complex production method, weak selectivity, etc., achieve reduction of flue gas emissions, low cost, and wide source of raw materials Effect

Inactive Publication Date: 2008-02-27
任利华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents are not very selective for the components to be modified in coal tar pitch, and do not reflect the resinization of coal tar pitch
There is also the problem that its production method is more complicated and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 500g of coal tar and put it into a reaction kettle. Under stirring conditions, heat up to 85°C at a heating rate of 5°C / min; add 75g of formaldehyde solution with a content of 35%, and add 25% of HCl aqueous solution to adjust the pH value of the aqueous solution to 0.1 , control the temperature of the reactor <130°C, and keep the pressure of the reaction material at 0.2Mpa for 90 minutes. After the polymerization reaction is completed and the pressure in the kettle is zero, vacuumize until the moisture content is <2%. The softening point is 10°C. The content of α component From 1.00% before the reaction to 1.01% after the reaction, the content of β component is 8.7%.

Embodiment 2

[0024] Weigh 500g of naphthalene oil and put it into a reaction kettle, and heat up to 65°C at a heating rate of 3°C / min; add 100g of 30% paraformaldehyde aqueous solution, add 30% H 3 PO 4 Aqueous solution, adjust the pH value of the aqueous solution to 1.0, control the temperature of the reactor <125°C, and keep the pressure of the reaction material at 0.2Mpa for 60 minutes. After the polymerization reaction is completed and the pressure in the kettle is zero, vacuumize until the moisture content is <2%. The temperature is 18°C, and the β component content is 9.5%.

Embodiment 3

[0026] Weigh 1000g of coal tar pitch with a softening point of 78°C and put it into the reactor, and heat up to 90°C at a heating rate of 3°C / min; add 150g of paraformaldehyde aqueous solution with a content of 30%, and add 30% H 2 SO 4 Aqueous solution, adjust the pH value of the aqueous solution to 0.2, control the reaction temperature <130°C, and keep the pressure of the reaction material at 0.25Mpa for 120min. After the polymerization reaction is completed and the pressure in the kettle is zero, add 30% NaOH aqueous solution, adjust the pH value to 7.0, and pump Vacuum to moisture<2% for testing, the softening point increased from 78°C to 134°C, the content of the α component increased from 7.25% before the reaction to 7.26% after the reaction, and the content of the β component was 30.6%.

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Abstract

A modified coal asphalt with linear resin molecule structure and adjustable softening point is prepared from one or more of coal tar, antracene oil, phenol oil, naphthelene oil and the coal asphalt with softening point lower than 130 deg.C through using acid to regulate pH value, and polymerizing reaction on formaldehyde or tripolyformaldehyde or polyformaldehyde which controlling temp, pressure and time.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a resinized modified coal tar pitch whose softening point can be adjusted within a certain range and a production method thereof. Background technique [0002] Coal tar pitch is the residue after distillation and extraction of coal tar. It is mainly composed of C and H elements. C / H is generally 18 / 1. The chemical composition of coal tar pitch is very complicated. It has been found that it is a eutectic mixture of various compositions. There are more than 70 kinds, so the method of solvent extraction is used to divide coal tar pitch into different material groups, which are called α component, β component, and γ component, which characterize the general characteristics of coal tar pitch. α component: It does not soften and melt when heated alone, exists in coal tar pitch in solid form, and is a non-graphitizable component, but α component can increase the amount of residu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10C3/02
Inventor 任利华李纯
Owner 任利华
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