Coal tar and hydrocarbon mixture pitch production using a high efficiency evaporative distillation process

a high-efficiency, distillation process technology, applied in the direction of metallic material coating process, chemical vapor deposition coating, building components, etc., can solve the problems of coal tar pitch decomposition, unwanted mesophase pitch formation, and low production efficiency of coal tar

Inactive Publication Date: 2005-12-01
KOPPERS DELAWARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This method produces coal tar pitches with enhanced softening points, reduced mesophase content, and lower PAH equivalents, suitable for binder applications and environmentally friendly, addressing the supply and environmental issues of traditional methods.

Problems solved by technology

The other is a declining supply of crude coal tar from the coke-making process.
No commercially attractive substitute for coal tar pitch in the aluminum industry has been developed, however.
Although higher softening points of up to 180° C. can be reached using batch distillation, the combination of high heat and longer residence time can often lead to decomposition of the coal tar pitch and the formation of unwanted mesophase pitch.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0023] A feed coal tar pitch having a softening point of 109° C. is fed into a WFE apparatus having a 1.4 square foot vessel operating at a temperature of 335° C. at a feed rate of 95 pounds / square foot / hour. The output coal tar pitch of the WFE apparatus has a pitch yield of 73%. A laboratory analysis of the output coal tar pitch is summarized in the following Table III:

TABLE IIISoftening Point, ° C.163.0Toluene Insolubles, wt. %37.7Quinoline Insolubles, wt. %17.0Coking Value, Modified Conradson, wt. %71.6Ash, wt. %0.22Specific Gravity, 25 / 25° C.1.36Beta Resin, wt. %20.7

example 3

[0024] A feed coal tar pitch having a softening point of 109° C. is fed into a WFE apparatus having a 1.4 square foot vessel operating at a temperature of 350° C. at a feed rate of 65 pounds / square foot / hour. The output coal tar pitch of the WFE apparatus has a pitch yield of 74.2%. A laboratory analysis of the output coal tar pitch is summarized in the following Table IV:

TABLE IVSoftening Point, ° C.200.0Toluene Insolubles, wt. %42.2Quinoline Insolubles, wt. %18.2Coking Value, Modified Conradson, wt. %76.5Ash, wt. %0.27Specific Gravity, 25 / 25° C.1.378Beta Resin, wt. %24.1

example 4

[0025] A feed coal tar pitch having a softening point of 109° C. is fed into a WFE apparatus having a 1.4 square foot vessel operating at a temperature of 365° C. at a feed rate of 67 pounds / square foot / hour. The output coal tar pitch of the WFE apparatus has a pitch yield of 67%. A laboratory analysis of the output coal tar pitch is summarized in the following Table V:

TABLE VSoftening Point, ° C.225Toluene Insolubles, wt. %48.9Quinoline Insolubles, wt. %23.3Coking Value, Modified Conradson, wt. %81.2Ash, wt. %0.24Specific Gravity, 25 / 25° C.1.365Beta Resin, wt. %25.7

[0026] The output coal tar pitch having a softening point in the range of 140° C. to 300° C., and preferably in the range of 150° C. to 250° C., may be used as a binder for carbon-carbon composites and friction materials, and in the production of graphite electrodes and anodes used for aluminum production. In addition, the output coal tar pitch having a softening point in the range of 140° C. to 300° C., and preferably...

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Abstract

Described are methods that utilize high efficiency evaporative distillation to make a high softening point coal tar pitch, a quinoline insoluble-free and ash-free coal tar pitch having a desired softening point, and a mesophase coal tar pitch. Each of the methods uses a feed coal tar pitch having a softening point in the range of 70° C. to 160° C. The methods may be carried out using appropriate conventional distillation equipment, a wiped film evaporator, or a thin film evaporator.

Description

FIELD OF THE INVENTION [0001] The present invention relates to the distillation of coal tar pitch or other coal derived streams for the production of coal tar and hydrocarbon mixture pitches and other by-products, and in particular to the production of coal tar hydrocarbon mixture distillates and residues using a high efficiency evaporative distillation process. BACKGROUND AND DESCRIPTION OF THE PRIOR ART [0002] Coal tar is a primary by-product material produced during the destructive distillation or carbonization of coal into coke. While the coke product is utilized as a fuel and reagent source in the steel industry, the coal tar material is distilled into a series of fractions, each of which are commercially viable products in their own right. A significant portion of the distilled coal tar material is the pitch residue. This material is utilized in the production of anodes for aluminum smelting, as well as electrodes for electric arc furnaces used in the steel industry. In evalua...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F16D69/02C01B31/04C08J3/00C08L1/00C08L95/00C10C1/00C10C1/04C10C1/16C10C1/20C10C3/00C10C3/02C10C3/06C10C3/10C10L1/32C23C16/00
CPCB29C47/0004B29C47/0009B29C2947/92704C04B35/522C04B35/532C04B35/83C04B2235/6021C04B2235/614C04B2235/77C04B2235/96C08J3/201C08J2395/00C10C1/16C10C3/002C10C3/06C10L1/322F16D69/023C08L95/00C08L2555/54B29C47/92B29C48/022B29C48/03B29C48/92B29C2948/92704
InventorSAVER, WILLIAM E.MCHENRY, E. RONALD
OwnerKOPPERS DELAWARE INC