重油直接裂解制乙烯技术的开发

DEVELOPMENT OF ETHYLENE PRODUCTION USING HEAVY OIL CONTACT CRACKING PROCESS

采用类似于催化裂化的流态化“反应 再生”工艺技术 ,实现了重油直接裂解制乙烯 ,并兼产丙烯、丁烯和轻质芳烃 (BTX等 ) ,有效地拓宽了乙烯生产原料的选择范围。研制了性能良好的催化剂 ,该催化剂具有活性高 ,选择性好 ,抗碱氮中毒和重金属污染能力强 ,水热稳定性和抗热冲击性能优良的特点。评价试验结果表明 ,典型石蜡基常压渣油在优化的工艺条件下 ,单程裂解的乙烯质量产率可达 2 6% ,C2 ～C4 总烯烃质量产率超过 50 %。经济评价结果表明 ,该工艺与石脑油管式炉裂解工艺相比 ,可使乙烯成本降低约 2 5%。

Heavy Oil Contact Cracking (HCC) is a technique similar to FCC fluidized “reaction regeneration” technique to produce ethylene using direct cracking of heavy oil and simultaneously produce propelene,butylene and light aromatics(BTX),effectively widening the selection scope of ethylene feedstocks.An excellent catalyst was developed.It is characterized by high activity,good selectivity,strong resistance to base nitrogen poisoning and heavy metal contamination,good thermal stability and thermal shock.The evaluation results showed that under optimized process conditions,the ethylene yield of typical paraffinic atmospheric residue through single pass cracking reaches 26% and the total yield of olefins(C 2～C 4) exceeds 50%.The economic evaluation showed that the ethylene cost can be reduced by 25% than that of gas oil pipe still pyrolysis process.