Method for preparing needle coke with low thermal expansion coefficient by combination of fluidized coking and delayed coking
A low thermal expansion coefficient, delayed coking technology, used in coking carbonaceous materials, coke ovens, multi-stage series-connected refining and cracking processes, etc. To deal with problems such as complex process, to achieve the effect of facilitating industrialization and application, and shortening the pretreatment process
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Embodiment 1
[0029] Get 1000g catalytic cracking tar (wherein sulfur content is 2.4%), take by weighing 30% hydrogen peroxide solution 177g according to the stoichiometric ratio that oxygen / sulfur ratio is 1, so that thiophene sulfur oxidation in raw material oil becomes sulfoxide; Hydrogen mixed with catalytic cracking tar enters the fixed bed reactor from the lower part, and MoO 3 Loaded on mesoporous Al 2 o 3 As a catalyst, the fixed-bed reaction temperature is set at 60°C, and the reaction time is set at 3 hours; the oil-water separation of the reacted product is carried out to obtain oxidized raw oil; the oxidized catalytic cracking tar is added to the fluidized coking reactor, and the load is selected. 3% MgO coke powder is used as the heat carrier, the fluidized coking temperature is set at 470°C, and the oil and gas residence time is 15s. In the subsequent fractionation tower, cut out the 350-500°C fraction; the solid content of this fraction is 12μg·g -1 , the S content is 0.4%...
Embodiment 2
[0032] Get 1000g catalytic oil slurry (wherein sulfur content is 3.3%, asphaltenes content 10.3%), according to the stoichiometric ratio that oxygen / sulfur ratio is 1.5, take by weighing tert-butyl peroxide 928g, so that thiophene sulfur is oxidized into Sulfone and sulfone; mix hydrogen peroxide and catalytic cracking tar and enter the fixed bed reactor from the bottom, use phosphotungstic acid as the catalyst, set the fixed bed reaction temperature to 80°C, and set the reaction time to 1.0h; The oxidized raw oil is obtained after tert-butanol is distilled from the product; the oxidized catalytic cracking tar is added to the fluidized coking reactor, coke powder loaded with 5% CaO is selected as the heat carrier, and the fluidized coking temperature is set at 480 °C, The oil and gas residence time is 25s. The oil and gas obtained from the top of the fluidized coking tower and the heat carrier are separated by cyclone. After the liquid phase product is condensed, it enters the ...
Embodiment 3
[0035] Get the subtractive four-line fraction (wherein sulfur content is 3.0%) of 1000g naphthenic crude oil, choose oxygen as oxygenant, oxygen and stock oil enter ebullating bed reactor from the bottom, with V 2 o 5 supported on mesoporous SiO 2 As a catalyst, the oxidation reaction temperature is set at 100 ° C, and the reaction time is 4.0 h to obtain oxidized feedstock oil; the oxidized feedstock oil is added to the fluidized coking reactor, and coke powder loaded with 5% Cs is selected as the heat carrier. The fluidized coking temperature is set at 490°C, and the oil and gas residence time is 10s. The oil and gas obtained from the top of the fluidized coking tower and the heat carrier are separated by a cyclone. 500°C fraction; the solid content of this fraction is 10μg·g -1 , the S content is 0.4%, the asphaltene content is 0%, and the 2-5 ring aromatic hydrocarbon content is 82%;
[0036] The fraction was subjected to pulse delayed coking to prepare green coke. Acco...
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