Process for treating waste materials
阅读：385发布：2020-12-02
专利汇可以提供Process for treating waste materials专利检索，专利查询，专利分析的服务。并且A process for treating odiferous industrial and municipal waste materials by adding formaldehyde, nitric acid and urea to the waste materials in sequence in order to obtain an economically desirable product.，下面是Process for treating waste materials专利的具体信息内容。
2. A process according to claim 1, including during step (1), heating the mixture of the waste material and formaldehyde to a temperature of about 80* C.
2. slowly adding a concentrated aqueous nitric acid solution to the mixture free of urea and mixing same therein for a period of time sufficient to further homogenize the mixture and to form nitrogen oxide gas to react with the waste material, the amount of nitric acid added being from about 3 percent to about 10 percent by weight of the waste material and sufficient to result in the formation of a mixture having a pH of about 2-4;
3. after formation of nitrogen oxide gas has stopped, then adding granular urea to the mixture in an amount at least sufficient to react with all the formaldehyde in the mixture and stirring it until the mixture is homogeneous in order to form urea-formaldehyde condensation products;
3. A process according to claim 1, in which the nitric acid is added in the form of a concentrated nitric acid solution containing from about 70 to 71 percent nitric acid and the balance is water.
4. A process according to claim 1, in which the amount of urea added to the mixture is in excess of that required to react with all the formaldehyde in the mixture so that the final solid product contains unreacted urea therein.
4. and then drying the mixture to obtain a solid product.
5. A process according to claim 1, in which the amount of formaldehyde added to the organic waste material ranges from about 25 percent to at least about 100 percent, by weight, based on the weight of the waste material treated.
6. A process according to claim 1, in which the organic waste material is a paper mill waste and including the step of screening the dried solid product to separate cellulosic fibers from the remaining solid material in order to recover the cellulosic fibers and the remaining solid material separately.
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