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Direct production of high purity Fisher-Tropsch wax

A hydrocarbon wax and product technology, applied in the field of slurry type hydrocarbon synthesis, can solve the problems of time-consuming and cost-consuming

Inactive Publication Date: 2004-09-08
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This additional treatment is somewhat time consuming and costly because Fischer-Tropsch waxes are usually hydrotreated to achieve high purity

Method used

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  • Direct production of high purity Fisher-Tropsch wax
  • Direct production of high purity Fisher-Tropsch wax

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Synthesis of Fischer-Tropsch wax without external continuous hydrogen treatment

[0030] A mixture of hydrogen and carbon monoxide syngas (H 2 :CO=2.1:1) is converted to heavy paraffins in a slurry bubble column reactor vessel, which is a multi-vessel HCS unit with processing equipment for removing the circulating slurry from the Catalyst deactivation components were removed similar to the method disclosed by Hsia in US 5,260,239. The catalyst used was a cobalt rhenium supported on titania catalyst similar to that described in US 4,568,663. The reaction was carried out at 210°C and 275 psia. The feed was fed at a line speed of 16.7 cm / sec. The conversion of CO was 50%. Hydrogen was added at about 40 standard liters per minute (15°C, 1 atm). The system was equipped with a slurry channel valve, which was in the closed valve position, thereby setting the reactor's external hydrogen processing equipment to a non-operational mode. Fischer-Tropsch wax was wit...

Embodiment 2

[0031] Example 2: Synthesis of Fischer-Tropsch waxes with external continuous hydrogen treatment

[0032] Under conditions similar to those of Example 1, the slurry passage valve was set to the open position, thereby enabling operation of the reactor's continuous external hydrogen treatment equipment. Hydrogen was added to the treatment zone at about 90 standard liters per minute (15°C, 1 atm) and the average ester content of the Fischer-Tropsch wax withdrawn from the reactor was determined. The results are listed in Table 1.

[0033] Table 1

Embodiment

[0034] Example External Continuous Hydrogen Treatment Plant Average Ester Content

[0035] 1 off 3.5μmol / g-wax

[0036] 2 k 0.50μmol / g-wax

[0037] From the results reported in Table 1, it can be observed that the ester content of the wax decreases when the external continuous hydroprocessing plant is operated, thus confirming the direct purification of the circulating slurry containing the Fischer-Tropsch wax, which is then removed from the reactor. Extract directly.

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PUM

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Abstract

A hydrocarbon wax product from a hydrocarbon synthesis slurry comprising liquid synthesis product and catalyst particles is purified by introducing a portion of hydrocarbon synthesis slurry from a hydrocarbon synthesis zone to a treatment zone in which a treatment gas contacts the hydrocarbon synthesis slurry. Hydrogen or a hydrogen-containing gas is useful as the treatment gas. The gas treatment removes impurities from the hydrocarbon wax portion of the hydrocarbon synthesis slurry. Purified wax product is separated and removed in situ via wax withdrawal means. This avoids or minimizes the need for further treating the wax product.

Description

Field of Invention [0001] The present invention relates to a slurry-type hydrocarbon synthesis process in which impurities are removed in situ from a hydrocarbon slurry liquid comprising the crude wax product of a hydrocarbon synthesis reaction. Background of the Invention [0002] Hydrocarbon synthesis (HCS) methods using the Fischer-Tropsch process are well known and described in the art. In a Fischer-Tropsch process, for example, synthesis gas (CO+H 2 ) is converted over catalysts such as ruthenium, iron or cobalt catalysts to a variety of products including gaseous and liquid hydrocarbons, oxides and higher paraffin waxes which are usually solid. The quality of Fischer-Tropsch waxes is generally enhanced by catalytic conversion of Fischer-Tropsch waxes to lower boiling paraffins that fall within the boiling point range of gasoline and middle distillates. Such treatments primarily include hydroprocessing, such as hydroisomerization, hydrocracking, hydrofinishing, and mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/22C10G2/00C10G31/09
CPCB01J8/228C10G2/32C10G2/342C07C1/06
Inventor R·J·威滕布林克L·L·安塞尔D·F·瑞安L·F·伯恩斯
Owner EXXON RES & ENG CO