Optimization of glycol solvent to reduce BTEX emission
SHAN Yong-kang1, JIANG Hong1, HE Guang-mang2
1. College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China; 2. Kuqa Oil and Gas Development Department, PetroChina Tarim Oilfield Company, Kuerle 841000, China
Abstract: By means of conventional glycol dehydration process,the performances of three kinds of glycols (diethylene glycol,monoethylene glycol and triethylene glycol,i.e.DEG,MEG and TEG) are analyzed and compared through evaluating the reboiler load,the loss of glycol and the emission of benzene,toluene,ethylbenzene and xylenes (BTEX).It is found that the loads of dehydration reboiler for DEG and EG are low,the BTEX emission is reduced by more than 90% but the loss amount of glycol is large when the glycol circulation reaches 4 m3·h-1.The loss of glycol can be reduced by recycling glycol.Finally,it is concluded that TEG can be replaced by DEG and EG to solve the problem of excessive emission of BTEX in the regenerated gas when natural gas contains high contents of BTEX.
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