Process for chemicals and energy recovery

Details Process for chemicals and energy recovery Process for chemicals and energy recovery

D - Textiles, Paper

21

C

9/36.2

D21C 11/12 (2006.01) C10J 3/46 (2006.01) D21C 11/06 (2006.01)

Patent

CA 1272005

(57) Abstract The present invention relates to a process for recovering chemicals and energy from cellulose waste liquors preferably black kraft liquor obtained in a paper pulp sulphate process, comprising the following three distinct and separate steps: In the first step the concentrated black liquor is gasified in a pressurized gasification reactor by so called flash pyrolysis at 700 to 1300°C, preferably 800 to 1000°C, normally 800 to 900°C, whereby an energy rich gas is produced and in which the inorganic chemicals of the black liquor are contained in the form of molten suspended droplets mainly comprising sodium carbonate and sodium sulfide. In the second step the gas from the gasification reactor is rapidly cooled through direct contact with water, and with green liquor, which is formed when the molten droplets and the hydrogen sulphide are dissolved in the quench liquid. The cooled gas subsequently passes through a scrubber. In the lower section of the scrubber the gas is washed with circulating green liquor and in the upper section of the scrubber the gas is washed with a sodium hydroxide (or carbonate) solution and water for complete removal of any remaining sulfur bearing components in the gas. In the third step the now sulfur and particulates-free gas is used as a fuel for generating steam and, if it should be economically justified, also for production of electric power.

510549

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