Hydrocracking process

Details Hydrocracking process Hydrocracking process

1990-12-21

1992-06-09

Myers, Helane

Mineral oils: processes and products

Chemical conversion of hydrocarbons

With subsequent treatment of products

208108, 208102, 208103, 208104, 208 48R, C10G 4572, C10G 3700

Patent

active

051204266

ABSTRACT:
An improved hydrocracking process, in a process for conversion of components of a heavy hydrocarbon feed to lighter, more valuable products, wherein the feed comprises foulant, the process comprising: (a.) contacting the feed with hydrogen, in the presence of a hydrocracking catalyst, at an elevated temperature and pressure in a hydrocracker, to produce a hydrocracker effluent comprising foulant; (b.) cooling and depressurizing the hydrocracker effluent to form a cooled, depressurized hydrocracker effluent comprising foulant; (c.) separating the cooled, depressurized hydrocracker effluent into the products of the conversion and an unconverted portion of the hydrocracker effluent which comprises foulant; and (d.) recycling, as effluent recycle to the hydrocracker, the unconverted portion of the hydrocracker effluent to the hydrocracker, wherein the concentration of foulant in the hydrocracker effluent is increased; the improvement comprising: (i.) partially cooling the hydrocracker effluent in a first cooler to a temperature at which the foulant remains soluble in the hydrocracker effluent to form a first cooled stream comprising unprecipitated foulant; (ii.) withdrawing a withdrawn portion of the first cooled stream and cooling the withdrawn portion to a temperature, below the temperature of the first cooled stream, at which foulant precipitates to form a second cooled stream comprising precipitated foulant; (iii.) removing the precipitated foulant from the second cooled stream to form a third cooled stream having a reduced concentration of foulant; and, (iv.) recycling the third cooled stream to the hydrocracker to reduce the concentration of foulant in the hydrocracker effluent.

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Encyclopedia of Chemical Processing and Design, Executive Editor John J. McKetta; "Hydrocracking", vol. 26, pp. 424-466.

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