Wet oxidizing process
AssigneeNippon Petrochemicals Company, Limited
InventorIsoo Shimizu
Life of this patent
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Abstract
In wet oxidizing process of an aqueous alkali waste which contains absorbed hydrogen sulfide and carbon dioxide, a convenient method for improving the safety in oxidizing operation and the efficiency in oxidation reaction. The process is characterized in that an equivalent weight number A of a strong acid consumed until the pH reaches about 9 and an equivalent weight number B of the strong acid consumed until the pH reaches about 4 in neutralization titration of the aqueous alkali waste, satisfy the relationship which is represented by the following equation [I]: 2A−B>0 [I]
Claims15
In a wet oxidizing process for oxidizing an aqueous alkali waste by using molecular oxygen, said aqueous alkali waste being obtained by bringing an aqueous alkali into contact with a hydrocarbon fluid containing hydrogen sulfide and carbon dioxide as the main acidic substances and absorbing said acidic substances, the improvement comprising determining an equivalent weight number A of a strong acid which is consumed until the pH of said aqueous alkali waste reaches about 9 and an equivalent weight number B of the strong acid which is consumed until the pH reaches about 4 in neutralization titration of said aqueous alkali waste prior to said oxidizing;
- calculating the value 2A−B;
- adding an alkali substance to the aqueous alkali waste prior to said oxidizing if the relationship in the following equation is not satisfied:
- 2A−B>0,
- in an amount so that the value of 2A−B prior to said oxidizing is greater than 0 but does not exceed 1.5,
- or adding an acid to the aqueous alkali waste prior to said oxidizing if the relationship in the following equation is not satisfied:
- 2A−B≦1.5,
- in an amount so that the value of 2A−B prior to said oxidizing is greater than 0 but does not exceed 1.5,
- said equivalent weight numbers A and B being based upon 1 liter of aqueous alkali waste, wherein said wet oxidation is performed by using continuous flow equipment.
A wet oxidation process for oxidizing an aqueous alkali waste by using molecular oxygen, said aqueous alkali waste being obtained by bringing an aqueous alkali into contact with a hydrocarbon fluid containing hydrogen sulfide and carbon dioxide as the main acidic substances and absorbing said acidic substances, consisting essentially of:
- a) determining an equivalent weight number A of a strong acid which is consumed until the pH of said aqueous alkali waste reaches about 9 and an equivalent weight number B of the strong acid which is consumed until the pH reaches about 4 in neutralization titration of said aqueous alkali waste prior to said oxidizing;
- b) calculating the value 2A−B;
- said equivalent weight numbers A and B being based upon 1 liter of aqueous alkali waste;
- c) adding an alkali substance to the aqueous alkali waste prior to said oxidizing if the relationship in the following equation is not satisfied:
- 2A−B>0,
- in an amount so that the value of 2A−B prior to said oxidizing is greater than 0 but does not exceed 1.5,
- or adding an acid to the aqueous alkali waste prior to said oxidizing if the relationship in the following equation is not satisfied:
- 2A−B≦1.5,
- in an amount so that the value of 2A−B prior to said oxidizing is greater than 0 but does not exceed 1.5;
- and
- d) carrying out the wet oxidation by oxidizing an aqueous alkali waste by using molecular oxygen.
Dependencies are inferred from the claim text.