| 摘要 |
The invention relates to a depressant and dispersant additive for paraffin base crude oil and to the process for producing the same. According to the invention, the additive comprises a toluene solution containing 45 ... 55 % by weight terpolymer resulted from the terpolymerization of 60 .... 70 % mol vinyl acetate with 35 ... 25 % mol fumaric diester having alkyl chains C18 -C26 and 5 % mol fumaric diester having the same number of carbon atoms in the alkyl chain, the remaining 55 ... 45 % being toluene having a depressant efficiency of 10 ... 20 degree C on the freezing point and a dispersant efficiency of 55 ... 75 % by weight reduction of paraffin deposits. The claimed process for producing the additive consists in subjecting to the terpolymerization with vinyl acetate at a temperature of 80 ... 100 degree C, for 14 ... 16 h, a mixture consisting of fumaric diester comprising 4 ... 6 % mol fumarate C18, 45 ... 55 % mol fumarate C20, 35 ... 35 % mol fumarate C22, 15 ...7 % mol fumarate C24, 1 ... 2 % mol fumarate C26, and a fumaric monoester having the same number of carbon atoms in the alkyl chain, in the presence of 1.5 ...2 % by weight benzoyl peroxide, thereby obtaining a terpolymer as a solution in toluene having a content of 45 ... 55 % by weight substance.
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