Operation method of middle distillate hydrotreating reactor, and middle distillate hydrotreating reactor

Abstract

There is provided an operation method of a middle distillate hydrotreating reactor which hydrotreats and hydroisomerizes a middle distillate including components of a boiling point range equivalent to gas oil among FT synthesis hydrocarbons synthesized by the Fisher-Tropsch synthesis reaction, the operation method comprising the steps of: bringing the middle distillate into contact with a catalyst to hydrotreat and hydroisomerize the middle distillate to produce hydrotreated middle distillate; measuring the cloud point of the hydrotreated middle distillate flowing out from the middle distillate hydrotreating reactor; and controlling the operating conditions of the middle distillate hydrotreating reactor so that the cloud point comes to a predetermined target value.

1 . An operation method of a middle distillate hydrotreating reactor which hydrotreats and hydroisomerizes a middle distillate including components of a boiling point range equivalent to gas oil among FT synthesis hydrocarbons synthesized by the Fisher-Tropsch synthesis reaction, the operation method comprising the steps of:
 bringing the middle distillate into contact with a catalyst to hydrotreat and hydroisomerize the middle distillate to produce hydrotreated middle distillate;   measuring the cloud point of the hydrotreated middle distillate flowing out from the middle distillate hydrotreating reactor; and   controlling the operating conditions of the middle distillate hydrotreating reactor so that the cloud point comes to a predetermined target value.   
     
     
         2 . The operation method of a middle distillate hydrotreating reactor according to  claim 1 ,
 wherein, in the step of measuring the cloud point, the cloud point is measured while cooling a obtained sample of the hydrotreated middle distillate at a cooling rate of 5.0° C./min or more and 15.0° C./min or less.   
     
     
         3 . The operation method of a middle distillate hydrotreating reactor according to  claim 1 ,
 wherein, in the step of measuring the cloud point, the cloud point is measured while cooling the obtained sample at the cooling rate controlled by an electronic cooling unit using a Peltier device.   
     
     
         4 . The operation method of a middle distillate hydrotreating reactor according to  claim 1 ,
 wherein, in the step of controlling the operating conditions of the middle distillate hydrotreating reactor, at least one of hydrogen partial pressure, reaction temperature, and throughput of middle distillate per unit time is controlled.   
     
     
         5 . A middle distillate hydrotreating reactor which hydrotreats and hydroisomerizes a middle distillate including a component of a boiling point range equivalent to gas oil among FT synthesis hydrocarbons synthesized by the Fisher-Tropsch synthesis reaction, the reactor comprising:
 a sampling unit which takes a sample of the produced hydrotreated middle distillate; and   a cloud point measuring unit which measures the cloud point of the obtained sample.   
     
     
         6 . The middle distillate hydrotreating reactor according to  claim 5 ,
 wherein the sampling unit is connected to the cloud point measuring unit by piping so as to automatically take the sample and transfer the sample to the cloud point measuring unit, and the cloud point measuring unit automatically measures the cloud point of the transferred sample.   
     
     
         7 . The middle distillate hydrotreating reactor according to  claim 5 ,
 wherein, the cloud point measuring unit includes a cooler capable of cooling the obtained sample at a cooling rate of 5.0° C./min or more and 15.0° C./min or less.   
     
     
         8 . The middle distillate hydrotreating reactor according to  claim 7 ,
 wherein the cooler is an electronic cooling unit using a Peltier device.