高效降凝剂的合成与改性

Synthesis and Modification of High Efficiency Pour Point Depressant

在氮气保护下,以摩尔比为9∶5∶1的丙烯酸十八酯、马来酸酐、苯乙烯为单体,甲苯为溶剂,过氧化二苯甲酰为引发剂,在80℃下合成了丙烯酸十八酯-马来酸酐-苯乙烯三元共聚物(降凝剂A);在甲苯溶剂中,120℃下分别用脂肪醇/脂肪胺对降凝剂A进行醇解/胺解,合成了降凝剂B/降凝剂C。考察了降凝剂A用于大庆原油降凝时所需的最佳引发剂用量;在大庆原油中分别加入0.5%(w)的降凝剂A,B,C,考察了不同降凝剂对大庆原油的降凝和降黏效果。实验结果表明,合成降凝剂A的最佳引发剂用量为1.0%(基于总单体质量);降凝剂C在降凝和降黏方面都优于降凝剂A和降凝剂B,使用降凝剂C时大庆原油倾点降幅最高达14℃、黏度最大降幅为56.78%;脂肪醇/脂肪胺的碳数影响降凝剂对原油的降凝和降黏效果。

A ternary copolymer,pour point depressant A,was prepared from octadecyl acrylate,maleic anhydride and styrene with mole ratio of 9∶5∶1 under the conditions of N2 atmosphere and 80 ℃ with toluene as the solvent and dibenzoyl peroxide as the initiator.Pour point depressants B and C were synthesized by alcoholysis and aminolysis of pour point depressant A with aliphatic alcohol and aliphatic amine respectively in toluene solvent at 120 ℃.The effect of the initiator dosage in synthesis of pour point depressant A on the pour point depression of Daqing crud oil was investigated.0.5%（w） Pour point depressants A,B and C were added separately to Daqing crude oil to investigate their pour point depression and visbreaking.The results showed that the optimal initiator dosage was 1.0%（w）（based on the total monomers）.Pour point depressant C was more effective for Daqing crude oil than A and B in the drops of the pour point and viscosity,the pour point drop could reach 14 ℃ and the viscosity could decrease by 56.78%.The carbon numbers of both the aliphatic alcohol and the aliphatic amine would influence the pour point depression and the visbreaking.