优化操作,生产植物抽提溶剂油

Optimization for Plant-Extracted Solvent Oil Production

长岭分公司催化重整装置的非芳烃分离塔,主要生产6号溶剂油和120号溶剂油。随着食品安全要求的提高,对植物抽提溶剂油产品质量标准要求更高,与6号溶剂油相比,植物抽提溶剂油馏程(恩氏蒸馏)由60～90℃调整为61～76℃,馏程变窄;对芳烃含量(特别是苯含量)提出了更加严格的控制指标,芳烃含量由不大于1%(质量分数)调整为苯含量(质量分数)不大于0.1%;溴指数由不大于1000mgBr/100g调整为不大于100mgBr/100g。在非芳烃分离塔不进行技术改造的前提下,要确保抽提溶剂油和120号溶剂油的馏程同时满足新产品质量要求,增大了生产难度。通过优化操作,控制芳烃抽提原料的初馏点,从而控制原料中C5-组分的含量,优化了非芳烃原料组成;抽提原料加氢用低温贵金属工艺替代常规加氢工艺,降低原料烯烃含量;调整非芳烃分离塔操作压力、侧线抽出口位置、抽出流量、回流比等操作参数,生产出满足新产品质量要求的植物抽提溶剂油和120号溶剂油,并实现装置的长周期运行。

The non-aromatic hydrocarbon separation tower of Sinopec Changling Company＇s catalytic reforming unit primarily produces solvent oil No.6 and No.120.As food safety standards become stricter,the requirements on the quality of plant-extracted solvent oil products are now higher.Compared with solvent oil No.6, plant-extracted solvent oil has a narrower distillation range （Engler distillation） , which changed from 60-90℃ to 61-76℃ ,and has had stricter standards for the contents of aromatic hydrocarbons （particularly the content of benzene）- the maximum allowable content of aromatic hydrocarbon is changed from 1% （by mass） to 0.1%. The maximum bromine index is changed to 100mgBr/100g from 1,000mgBr/100g.The need to ensure the distillation ranges of both extracted solvent oil and solvent oil No.120 meet the requirement on the quality of new product without carrying out a technical upgrade on the non-aromatic hydrocarbon separation tower has added to the difficulty in production.The composition of non-aromatic hydrocarbons was optimized by means of operation optimization ,namely controlling the content of C5 component in the feedstock for aromatics extraction by controlling the initial boiling point of the feedstock.In the extraction feedstock hydrogenation process,low-temperature noble metal technology was used in place of conventional hydrogenation technology to reduce the content of feedstock olefin.In addition,some operating parameters including the operating pressure of the non-aromatic hydrocarbon separation tower,the position of the side draw outlet,draw rate and reflux ratio,were changed.As a result,the unit produced plant-extracted solvent oil and solvent oil No.120 that met the requirements for the quality of new products and the unit achieved long-term stable operation.