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Apparatus for Separating Oxygenate Modifier from Oligomerization Effluent by Water Wash

a technology of oxygenate modifier and oligomerization effluent, which is applied in the direction of hydrocarbon preparation catalysts, organic chemistry, chemical/physical/physical-chemical processes, etc., can solve the problem of difficulty in providing a bottom product that comprises olefinic gasoline that can meet the vapor pressur

Inactive Publication Date: 2008-02-07
KLEINWORTH RUTH BUSKUS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach effectively reduces alcohol modifier concentrations in both overhead and bottoms streams, allowing for precise control of vapor pressure and alcohol content, improving the efficiency of oligomerization effluent fractionation without the need for separate water washing of both streams.

Problems solved by technology

Hence, it was difficult to provide a bottoms product that comprises olefinic gasoline that can meet the vapor pressure specification and, at the same time, provide an overhead product comprising mainly unreacted C4 hydrocarbons that can meet the alcohol specification.

Method used

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  • Apparatus for Separating Oxygenate Modifier from Oligomerization Effluent by Water Wash
  • Apparatus for Separating Oxygenate Modifier from Oligomerization Effluent by Water Wash

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[0033] We compared the process of directly fractionating the effluent from an oligomerization zone to water washing the effluent from an oligomerization zone before fractionation by simulation. The oligomerization zone predominantly dimerizes C4 olefins to C8 olefins over a resin catalyst modified by TBA and SBA. In the fractionation column, the primary split is between C4 and lighter hydrocarbons and C5 and heavier hydrocarbons. At the operating specification that requires the bottoms oligomerization product to have a vapor pressure of 41 kPa (6 psi) or less, the split between C4− hydrocarbons and C5+ hydrocarbons would require at least 40% of the C5 hydrocarbons to be distilled to the overhead. Unfortunately, under these conditions, the concentration of TBA / SBA modifier that is carried with the C5 hydrocarbons to the overhead stream exceeds 1,000 ppm which is much higher than the typical 5 ppm alcohol limits required of the overhead stream. In fact, to meet a 5 ppm alcohol limits ...

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Abstract

It has now been disclosed that by directing the effluent from an oligomerization reactor to a water wash column to remove alcohol modifier from the hydrocarbon stream before sending it to a fractionation column offers flexibility in providing a bottoms product of a desired vapor pressure without increasing the concentration of alcohol modifier in the overhead stream beyond alcohol concentration limits.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a Division of copending application Ser. No. 10 / 125,630 filed Apr. 18, 2002, the contents of which are hereby incorporated by reference in its entirety.FIELD OF THE INVENTION [0002] This invention relates to a process and apparatus for separating oxygenate modifiers from product oligomerized hydrocarbons. Specifically, alcoholic modifiers are separated from oligomerized hydrocarbons by a water wash column. BACKGROUND OF THE INVENTION [0003] Processes for the oligomerization of light olefins to produce C8 olefin oligomers are known. Oligomerization processes have been long employed to produce high quality motor fuel from C4 olefins. Such oligomerization processes are also referred to as catalytic condensation and polymerization with the resulting motor fuel often referred to as polymer gasoline. Methods have always been sought to improve the octane number of the gasoline boiling range oligomerization products. Indirect...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C7/08
CPCC07C2/28C07C7/08C07C2531/08C07C11/02
Inventor KLEINWORTH, RUTH BUSKUSLUEBKE, CHARLES P.
Owner KLEINWORTH RUTH BUSKUS