GB459232A - Improvements in the treatment with hydrogenating gases of carbonaceous materials - Google Patents

Abstract

<PICT:0459232/III/1> In the treatment of carbonaceous materials with hydrogenating gases congestions in the apparatus, particularly in the tube heaters, are mitigated by ascertaining attendant fluctuations in pressure and introducing into or before that part of the apparatus, where the fluctuations occur, a quantity of liquid, e.g. viscous oil not substantially volatile under the reaction conditions. The oil is preferably introduced so as not to mix with the reacting materials and to avoid intermixing no pumps or other devices causing mixing should be situated between the point of introduction of the oil and the point of congestion. If the congestion is caused by deposition of salts, e.g. ammonium chloride or carbonate, water is introduced as the liquid. Small fluctuations in pressure are measured by a U-tube U half filled with mercury and connected to a pressure balance D of usual type through lines L, M, and a catchpot B. The free ends O, P of the balance and U-tube are connected through catch-pots C, A, to the points of the apparatus at which the difference of pressure is to be measured. A plant comprising preheaters K, reaction tubes Q, R, separator U, cooler V and heat - exchanger J is provided with three such pressure measuring devices so as to measure pressure difference between the ends of the heat-exchanger J, preheater K, and cooler V, respectively, and pumps II, III, IV are provided for the introduction of flushing liquid into the parts referred to.