请问在化工行业PDH是什么意思？

请问在化工行业PDH是什么意思？

丙烷脱氢制丙烯(即Propane Dehydrogenation,英文简称为PDH)是丙烷在催化剂的作用下脱氢生成丙烯的工艺。通常丙烯是在炼制成品油过程中或裂解生产乙烯过程中的副产品,因此PDH提供了一种新的技术路径,即以丙烷替代各种馏分油为原料来集中生产丙烯。
全球乙烷裂解的增加，减缓了丙烯产量的增速，丙烯专产装置PDH 应运而生，至今已有逾20 年的历史。我国当前计划2014 年前建成的一期项目共有623 万吨/年的产能，其中437 万吨集中在江浙。

丙烷脱氢
Propane Dehydrogenation (PDH) is a catalytic dehydrogenation technology to produce propylene from propane. The Oleflex process, technology licensed by UOP.
There are 3 sections in the UOP Oleflex process:
Reactor section
Product recovery section
Catalyst regeneration section
The reactor section consists of four radial-flow reactors, charge and interstage heaters and the reactor feed-effluent heat exchanger.
In the recovery section the reactor effluent is cooled, compressed, dried, and sent to a cryogenic system to separate hydrogen from hydrocarbon. Separator liquid is sent to a selective hydrogenation unit to eliminate diolefins. Liquid hydrocarbon then goes to a Deethanizer and Propane-propylene (P-P) splitter to produce a polymer-grade propylene product. Unconverted propane is recycled to the reactor section.
The catalyst regeneration section continuously burns off coke and reactivates catalyst during its operation.