Method for purifying raffinate-2
A technology of raffinate and distillation column, applied in the field of high-purity and high-yield separation and refining of 1-butene, can solve the problems of inability to manufacture products, difficult to design refining process, etc., and achieve the effect of energy reduction
Active Publication Date: 2020-02-14
LG CHEM LTD
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Problems solved by technology
In particular, when the ratio of isobutene / 1-butene in the feed is high, it is difficult to design the refining process, and, in severe cases, there is a problem that the product cannot be produced
Method used
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Embodiment approach
[0046] Hereinafter, examples of the present invention will be described.
example 1
[0048] Raffinate-2 having the properties described in Table 1 below was used and figure 2 The process shown (except that preheating of raffinate-2 (E2) was not performed) was refined.
[0049] [Table 1]
[0050] components quality score C3's 0.48％ C4 paraffin 29.18％ Butene-1 43.73％ Isobutylene 0.25％ C4 olefins 25.94％ C5's 0.42％ sum 100.00％
example 2
[0052] except as figure 2 Refining of Raffinate-2 was performed in the same manner as in Example 1, except that preheating of Raffinate-2 (E2) was performed as shown in Example 1.
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Abstract
The present invention relates to a method for separating and purifying 1-butene from raffinate-2 stream at high purity and a high yield, the method comprising the steps of: supplying raffinate-2 including n-butane, isobutane and 1-butene to a first distillation column to obtain heavy raffinate-3 including n-butane from the lower part of the first distillation column and recovering an upper fraction including 1-butene from the upper part thereof; and supplying the upper fraction including 1-butene into a second distillation column to recover a first lower fraction, enriched with 1-butene, fromthe lower part of the second column and recovering light raffinate-3 including isobutene from the upper part thereof, wherein the heat of the upper fraction recovered from the upper part of the firstdistillation column is supplied to the lower part of the second distillation column through a first heat exchanger, and 1-butene at high purity and high yield can be recovered while an energy recoveryamount is maximized by means of a double effect distillation.
Description
technical field [0001] This application claims priority from Korean Patent Application No. 10-2017-0096789 filed with the Korean Intellectual Property Office on July 31, 2017, the entire disclosure of which is incorporated herein by reference. [0002] The present invention relates to a method for refining a raffinate-2 stream discharged from a process for separating C4 mixtures, and more particularly to a method for separating and refining 1- butene method. Background technique [0003] The C4 fraction from naphtha cracking centers (feed C4) is a mixture of C4 species with single, double or triple bonds, which is also called C4 mixture (mixed C4). [0004] Typically, subsequent processes from the C4 fraction involve processes for the separation and removal of butadiene, a raw material for the synthesis of rubber. Butadiene is separated and removed, for example by extraction or extractive distillation. The remaining C4 stream after removal of butadiene is a hydrocarbon mi...
Claims
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IPC IPC(8): C10G63/04
CPCC10G7/00C10G70/041C07C7/04Y02P20/10C07C9/10C07C9/12C07C11/08C10G63/04C10G2300/1037C10G2300/1088C10G2300/1081C10G2300/4025C10G2400/20B01D3/146C07C7/005B01D3/143B01D3/007
Inventor 金性均李成圭边容鏋申俊浩金智惠
Owner LG CHEM LTD