CN1193621A - Method for producing alkyl sulfates from refinery gas - Google Patents

Abstract

A process for preparing alkylsulfate with the gas from refinery as raw material includes such steps as preparing branched-chain olefin with the gas from refinery, reaction on concentrated sulfuric acid, and neutralization to obtain alkylsulfate with high surface activity, and features easily available raw material, short production period, low cost, and easily controlled quality. Its product has better wetting, emulsifying and dispersing powers, so that it can be used as emulsifier, oil-displacing agent and additive of cement.

Description

A kind of is the method that raw material is produced alkyl-sulphate by refinery gas

The present invention relates to a kind of is the method that raw material is produced alkyl-sulphate by refinery gas

Alkyl-sulphate synthetic traditional technology mainly is: be the direct sulphating of raw material with the higher alkene or make high fatty alcohol by higher alkene through carboxyl is synthetic, make reagent and its generation sulphating with sulfuric acid, chlorsulfonic acid or sulphur trioxide etc. again.The linear alpha-olefin that this type of technology higher alkene is made by ethylene oligomerization or wax cracking usually, esterification is to the ingredient requirement height, raw materials pretreatment and sepn process are numerous and diverse, production cycle is longer, the present invention is directed to the problem of present existence, through a large amount of tests, developing a kind of is the method that raw material is produced alkyl-sulphate by refinery gas.

The objective of the invention is to, develop a kind of be the method that raw material is produced alkyl-sulphate by refinery gas, this method adopts the C in refinery gas ₃, C ₄Mixed composition is a raw material, makes the branched-chain alkene mixture through polymerization catalyst, and this mixing higly branched chain alkene and the vitriol oil (purity 80-100%) carry out normal-temperature reaction, gets sulfating product; Sulfating product is neutralized through simple separation, can obtain having the active alkyl-sulphate of certain surface, the branched-chain alkyl vitriol of gained, the alkyl-sulphate that promptly has high surface, the branched-chain alkyl vitriol of gained promptly has good wetting, emulsification and dispersive ability, compare with traditional technology, have ingredient requirement low, characteristics with short production cycle have reduced production cost, and condition simplifies the operation, quality product is easy to control, can be used as emulsifying agent, oil-displacing agent and cement additive etc. provide the new way that fully utilizes refinery gas simultaneously.

Of the present invention a kind of be the method that raw material is produced alkyl-sulphate by refinery gas, this method is divided the following step:

(a), will be by the C in the refinery gas ₃, C ₄Mixed alkanes alkene is without separation, and directly the carbon number distribution that makes through catalyzed polymerization in fixed-bed reactor is C ₅-C ₂₅Branched-chain alkene, the temperature of reaction by the control catalyst bed obtains desired olefin hydrocarbon molecules amount and distributes, and regulates the physical and chemical performance of alkyl-sulphate;

(b), with the vitriol oil of alkene and 80-100% with 10: the volume ratio of 1-5 is mixed, stirring reaction 0.5-24 hour, below temperature 0-50 ℃, the reaction product standing demix;

(c), separate phase up and down, on get extract (1) with the dehydrated alcohol extracting mutually, remaining oil utilizes as the raw material thing of (b) step reaction, extract (1) gets product (2) through evaporation concentration;

(d), with products therefrom (2) and down mutually solution mix, dilute with water, with the alkali neutralization, evaporation concentration can get the product of active matter content 60-80% then.

Embodiment 1:

At first will be by the C in the refinery gas ₃, C ₄Mix alkane alkene in fixed-bed reactor, get through catalyzer and make carbon number distribution and be C ₅-C ₂₅Branched-chain alkene, then with the vitriol oil of this alkene and 80-100% with 10: the volume ratio of 1-5 is mixed, and stirring reaction 0.5-4 hour, temperature was below 40 ℃, the reaction product standing demix; Separate phase up and down again, on get extract (1) with the dehydrated alcohol extracting mutually, remaining oil utilizes as the raw material thing of (b) step reaction, extract (1) gets product (2) through evaporation concentration; With products therefrom (2) and solution mixing mutually down, dilute with water 0.5-1 doubly neutralizes with alkali then again, and evaporation concentration can get the product of active matter content 60-80%.

Claims (1)

1, a kind of is the method that raw material is produced alkyl-sulphate by refinery gas, it is characterized in that this method is divided the following step:

(a), will be by the C in the refinery gas ₃, C ₄The carbon number distribution that mixing alkane alkene makes through catalyzed polymerization in fixed-bed reactor is C ₅-C ₂₅Branched-chain alkene, the temperature of reaction by the control catalyst bed obtains desired olefin hydrocarbon molecules amount and distributes, and regulates the physical and chemical performance of alkyl-sulphate;

(b), with the vitriol oil of alkene and 80-100% with 10: the volume ratio of 1-5 is mixed, stirring reaction 0.5-24 hour, below temperature 0-50 ℃, the reaction product standing demix;

(c), separate phase up and down, on get extract (1) with the dehydrated alcohol extracting mutually, remaining oil utilizes as the raw material thing of (b) step reaction, extract (1) gets product (2) through evaporation concentration;

(d), with products therefrom (2) and down mutually solution mix, dilute with water, with the alkali neutralization, evaporation concentration can get the product of active matter content 60-80% then.