Claims
- 1. In the wet combustion method of combusting organic material including oxidation-resistant substances of lignocellulosic origin comprising low-molecular-weight acids which comprising the group including acetic acid proprionic acid or salts thereof, dissolved or suspended in a liquid comprising waste liquor obtained from wood pulping processes in which the organic material is oxidized by contact with air or oxygen at a temperature ranging between 180.degree. C. and 340.degree. C. and at a correspondingly superatmospheric pressure, the improvement comprising:
- (a) a first oxidizing step, in which the organic material is partially oxidized by introducing into said liquid a molecular oxygen at a temperature and superatmospheric pressure and in an amount corresponding substantially to the theoretical value required to release a portion on the order of 75%-95% of the total heat value of said organic material;
- (b) a second oxidizing step, in which high temperature superatmospheric molecular oxygen is introduced into said liquid in an amount in excess of the theoretical value sufficient to oxidize the residual oxidation-resistant substances and to impart to the effluents generated in said second step a molecular oxygen content sufficient to achieve the partial oxidation in said first step; and
- (c) feeding the thus oxygenated effluents to said first step.
- 2. The method according to claim 1, in which oxidation in the first step is carried out by passing a stream of heated compressed air concurrently with a flow of said liquid within a confined reaction zone, and in which the oxidation in the second step is carried out by passing a stream of hot compressed air countercurrent to a flow of said liquid within a separate confined reaction zone.
Parent Case Info
This is a continuation of application Ser. No. 06/551,977 filed 11/5/83, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2143077 |
Mar 1972 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
551977 |
Nov 1983 |
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