METHOD FOR SLOW COKING Russian patent published in 2012 - IPC C10B55/00 

FIELD: chemistry.

SUBSTANCE: starting material is heated in a heat exchanger 1 to 230-270°C and then to 350-430°C in a furnace 2. The hot material is fed into the bottom part of an evaporator 3 and mixed with a recirculator - heavy coker gasoil to form secondary material which is heated to reaction temperature 460-510°C in a heating-reaction furnace 5, followed by coking in one of the alternately working coking chambers 6. The formed distilled products from chambers 6 are fed for fractionation into the bottom part of a fractionation column 4 to obtain gas, gasoline, light gasoil, heavy gasoil and still residue which is fed for mixing with hot secondary material before being fed into the coking chamber 6. The quality and amount of the still residue and heavy coker gasoil is regulated by varying the temperature at the first tray in the bottom part of the fractionation column 4 by feeding heavy coker gasoil as circulating reflux.

EFFECT: longer time between repairs on the equipment and output of distilled products for producing engine fuel.

1 dwg, 3 tbl