Inhibitors of wax deposition for crude oils are polymers of a monomer with structural units derived from at least one ester (i) of an aliphatic carboxylic acid with an aliphatic alcohol, wherein one of the acid and alcohol is ethylenically unsaturated and the other of the acid and alcohol has a long chain group of 14-40 carbons, and a monomer with structural units derived from a corresponding ester (3) with structural units derived from an aliphatic carboxylic acid and an aliphatic alcohol, wherein one of the acid and alcohol is ethylenically unsaturated and the other has an aliphatic group of 1-13 carbons, such that at least 30% preferably 50-90% of the said aliphatic groups have 15-35 carbons. They are preferably made by transesterification. Blends of such polymers and/or the corresponding homopolymers or copolymers of ester 1 and/or polyalkylene imines with long side chains, and optionally with monomeric polar additives may be used as inhibitors.
原油蜡沉积
抑制剂是一种单体聚合物,其结构单元至少来自脂肪族
羧酸与脂肪族 醇的一种酯(i),其中酸和醇中的一种是
乙烯不饱和的,酸和醇中的另一种具有 14-40 个碳原子的长链基团;以及一种单体,其结构单元来自相应的酯(3),其结构单元来自脂肪族
羧酸与脂肪族 醇,其中酸和醇中的一种是
乙烯不饱和的,酸和醇中的另一种具有 14-40 个碳原子的长链基团、和一种单体,其结构单元来自相应的酯 (3),其结构单元来自脂肪族
羧酸和脂肪族醇,其中一种酸和醇是
乙烯不饱和的,另一种酸和醇具有 1-13 个碳原子的脂肪族基团,这样至少 30% 的上述脂肪族基团最好是 50-90% 具有 15-35 个碳原子。它们最好通过酯交换反应制成。这种聚合物的混合物和/或酯 1 和/或具有长侧链的聚亚烷基
亚胺的相应均聚物或共聚物,可与单体极性添加剂一起用作
抑制剂。