Improved method for the preparation of stop of process and production equipment of liquid hydrocarbons

摘要

The invention relates to a continous process for converting carbonaceous material contained in one or more feedstocks into a liquid hydrocarbon product, said feedstocks including the carbonaceous material being in a feed mixture including one or more fluids, said fluids including water, the process comprising: converting at least part of the carbonaceous material by: pressurising the feed mixture to an operational pressure in the range 150-400 bar, heating the feed mixture to an operational temperature in the range 300-450 °C, and maintaining said pressurized and heated feed mixture in the desired pressure and temperature ranges in a reaction zone for a predefined time; cooling the feed mixture to a temperature in the range 25-200 °C and expanding the feed mixture to a pressure in the range of 1-70 bar, thereby causing the carbonaceous material to be converted to a liquid hydrocarbon product; and separating from the converted feed mixture a fraction comprising liquid hydrocarbon product; where in a state of discontinued operation the inflow of feed mixture is terminated and the system is filled with a fluid;where the pressure and temperature is set to a predetermined desired level , where the temperature and the pressure are altered to the predetermined lower level at a predetermined rate and where the pressure during the altering is constantly kept at a level above the saturation pressure for the fluid at a given temparature.