A C4 Alkylation Process for Reducing Acid Consumption

Abstract

The invention discloses a C4 alkylation technology capable of reducing acid consumption. A flow of the C4 alkylation technology is as follows: (1) conveying a C4 raw material containing sodium ions into a C4 / C5 fractional distillation tower and carrying out fractional distillation; remaining part of the sodium ions at a tower bottom; at a tower top, condensing a gas phase into a liquid phase; returning part of the liquid phase back to the fractional distillation tower and discharging part of the liquid phase out from the fractional distillation tower to form an alkylation raw material; (2) conveying the alkylation raw material into a water washing tower and washing the alkylation raw material through reinforced circulating water and desalted water in sequence to enable the pH (Potential ofHydrogen) of the alkylation raw material to be less than or equal to 7.5; (3) then enabling the alkylation raw material to pass through a dialkene removing reactor and an alkylation reactor in sequence and then enter a fractional distillation system, so as to obtain alkylated oil, n-butane and isobutane respectively; taking isobutane as a raw material and returning isobutene back into the alkylation reactor; adding concentrated sulfuric acid into the alkylation reactor and discharging waste sulfuric acid in the alkylation reactor out of the alkylation reactor. The technology disclosed by theinvention can be used for effectively removing the sodium ions in the C4 raw material so that the pH value of the C4 raw material is effectively reduced to be 7.5 or lower and the dialkene removing reactor can be normally used.

Description

technical field [0001] The invention relates to a C4 alkylation process, in particular to a C4 alkylation process for reducing acid consumption. Background technique [0002] The conventional process of C4 alkylation unit is as follows figure 2 , the C4 raw material 101 enters the water washing tower 102, the purpose of the water washing tower is to wash away harmful impurities such as methanol and alkali etc. to the alkylation unit, and the C4 raw material after water washing enters the diene removal reactor 103. Under the action of a catalyst, a small amount of diolefins in the raw material are converted into monoolefins. After the raw material is pretreated, it enters the alkylation reactor 104 together with part of the isobutane 110 returned from product separation. In this reactor, the C4 raw material The olefins and isobutane are alkylated under the action of concentrated sulfuric acid 106 to finally generate the required alkylate 108, and the waste sulfuric acid 107 ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of increasing the sulfuric acid consumption of the C4 alkylation unit due to the alkali contained in the C4 raw material, this application proposes a C4 alkylation process that reduces acid consumption, and the sodium ion in the C4 raw material can be effectively removed by using this process. Removal, so that the pH value of the C4 raw material can be effectively reduced to below 7.5 after being washed by the water washing tower, so that the diene removal reactor can be put into normal use

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