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Method for separating narrow cut fraction industrial grade n-hexane from C5 to C7 light hydrocarbon mixture, as well as packed towel and float valve tower thereof

A mixture, n-hexane technology, applied in fractional distillation, hydrocarbon distillation, petroleum industry and other directions, can solve problems such as complex process, and achieve the effects of increasing economic benefits, reducing width and reducing benzene content

Active Publication Date: 2013-10-16
KANGJIA INDAL RESPONSIBLE +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The problem that exists is: process is complicated, needs hydrogenation twice, and yield only increases to 6.6% from 1.4%

Method used

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  • Method for separating narrow cut fraction industrial grade n-hexane from C5 to C7 light hydrocarbon mixture, as well as packed towel and float valve tower thereof
  • Method for separating narrow cut fraction industrial grade n-hexane from C5 to C7 light hydrocarbon mixture, as well as packed towel and float valve tower thereof
  • Method for separating narrow cut fraction industrial grade n-hexane from C5 to C7 light hydrocarbon mixture, as well as packed towel and float valve tower thereof

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[0024] as attached figure 1 shown, the slave C 5 to C 7 The method for separating narrow cut technical grade n-hexane in light hydrocarbon mixture is characterized in that it is carried out according to the following steps: raw material C 5 to C 7 The light hydrocarbon mixture enters the corrugated structured packing tower from the middle for rectification, the light components are separated from the top of the corrugated structured packing tower, and the middle and heavy components are separated from the bottom of the corrugated structured packing tower; separated from the bottom of the corrugated structured packing tower The intermediate components and heavy components enter the valve tower from the middle for rectification. The intermediate components, namely n-hexane components, are separated from the top of the valve tower, and the heavy components are separated from the top of the valve tower. The n-hexane separated from the top of the float valve tower is first cond...

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Abstract

The invention relates to a method for separating narrow cut fraction industrial grade n-hexane from a C5 to C7 light hydrocarbon mixture, as well as a packed tower and a float valve tower thereof. The method uses the C5 to C7 light hydrocarbon mixture as a raw material and adopts the simple rectification process of a two-tower separation sequence including the regular packed tower and the float valve tower, wherein the former tower is mainly used for stripping n-hexane, and the latter tower is mainly used for stripping benzene. The invention solves the three technical difficulties of narrowing the range of product fractions, reducing benzene content and increasing n-hexane yield during the production of industrial n-hexane, the content of product n-hexane is from 70 to 98 percent, the benzene content is not more than 0.1 percent, the distillation range is from 0.5 to 3 DEG C, and the yield is from 85 to 98 percent. The light components separated by the method are mixed with heavy components to obtain the product of solvent oil No.6, so that the resources of the original C5 to C7 light hydrocarbon mixture are thoroughly utilized, and thus, the economic benefits are increased.

Description

1. Technical field [0001] The petrochemical technology field that the present invention relates to is a kind of from C 5 to C 7 A method for separating narrow-fraction industrial-grade n-hexane from light hydrocarbon mixtures and its packed tower and valve tower. 2. Background technology [0002] n-hexane, also known as hexane, molecular formula C 6 h 14 , molecular weight 86.17, national standard number 31005, CAS number 110-54-3, English name is n-hexane, or hexyl hydride. It is a colorless volatile liquid with a faint characteristic odour. Melting point -95°C, boiling point 68.74°C. It is a non-polar solvent and is widely used in industries such as medicine, edible oil, spices, and rubber synthesis. Especially in the use of the first three, as an extraction agent, the fraction width of n-hexane directly affects the quality of edible oils, essential oils, etc., as well as technical indicators such as residual rate, oil yield, and energy consumption. The narrower the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/15C07C7/04B01D3/14C10G7/00
Inventor 马凤云刘景梅
Owner KANGJIA INDAL RESPONSIBLE
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