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50万t/a催化热裂解(CPP)制乙烯装置产生的裂解气中氧气含量较大,其会形成氧自由基并会引起重二烯烃的聚合反应而堵塞设备,同时裂解气中的氧气含量较高会影响聚合级乙烯和丙烯的产品质量。另外,氧加氢后生成水,水对后续的深冷工序有很大影响。某公司提供的脱氧脱氮催化剂,实际运行中结焦严重,再生频繁,最终被切除。后对裂解气除杂工艺进行更换,并与大连凯特利催化工程技术有限公司开展脱氧催化剂实验研究。目前氧含量由5×10-6降至1×10-6以下,达到预想除氧效果,具备实际工业应用条件。
The pyrolysis gas produced by 500,000 t / a catalytic pyrolysis (CPP) ethylene plant produces a large amount of oxygen, which forms oxygen radicals and can cause the polymerization of heavy diolefin to block the equipment. At the same time, the oxygen content in the cracked gas Higher will affect the product quality of the polymerization grade ethylene and propylene. In addition, oxygen hydrogenation to generate water, water on the subsequent cryogenic processes have a great impact. A company to provide deoxygenation catalyst, the actual operation of coking serious regeneration frequent, and ultimately be removed. After the pyrolysis gas impurity removal process replacement, and Dalian Kateli Catalytic Engineering Co., Ltd. to carry out deoxidation catalyst experimental study. At present, the oxygen content is reduced from 5 × 10-6 to below 1 × 10-6 to achieve the expected oxygen scavenging effect, and has practical industrial application conditions.