31results about How to "Recycling resources" patented technology

The invention relates to a high calcium organic wastewater treatment method, which comprises: mixing industrial wastewater containing 0.1-20% by mass of organic calcium carboxylate and an inorganic acid according to a molar ratio of 1:1-1:0.2, carrying out an acidification reaction at a temperature of 50-90 DEG C, and separating the resulting mixed material to obtain an inorganic calcium salt crude product; carrying out a liquid-liquid extraction reaction on an aqueous solution containing the organic carboxylic acid and a small amount of the inorganic calcium salt compound to generate an organic carboxylic acid complex having a boiling point of more than a boiling point of the organic carboxylic acid; and carrying out pressure reduction distillation on the upper layer material containing the organic carboxylic acid complex, collecting a distillate with a gas temperature of 60-100 DEG C, and carrying out nature sedimentation separation on the distillate, wherein an organic carboxylic acid aqueous solution with a mass fraction of 20-85% is obtained from the lower layer, and the upper layer material is mixed with the residual liquid on the bottom of a pressure reduction distillation kettle to obtain a recycled extraction agent. The method has characteristics of simple process, less raw material consumption, high yield, high production efficiency, easy reaction process enlargement, and source re-utilization achievement.

The present invention is process of treating mother liquid residue from sodium formate method to produce sodium hyosulfate and after being rectified to recover methanol. The process includes the following steps: 1. concentrating to obtain concentrated residue with or without sodium formate recovery; 2. incinerating the concentrated residue in a converter or one combined furnace to obtain incinerated clinker; 3. discharging high temperature clinker; 4. dissolving the clinker to form water solution; 5. absorbing SO2 from the incinerating fume with the water solution; and 6. adding sulfur to theabsorbed solution to prepare sodium thiosulfate. The process can eliminate pollutant while producing sodium thiosulfate as chemical material.

The invention discloses a nitrile group type carbon fiber precursor spinning pretreatment process. According to the technical scheme, the process includes the following steps that 1, nitrile group type carbon fiber precursors are subjected to continuous mold pressing curling forming at normal temperature; 2, the nitrile group type carbon fiber precursors obtained in the step 1 are added to a shaping furnace and instantly heated to the shaping temperature in a vacuum state, the vacuumizing time ranges from 5 min to 45 min, achieved negative pressure ranges from 3,000 pa to 5,000 pa, temperature rise time ranges from 5 min to 45 min, and the achieved temperature ranges from 90 DEG C to 150 DEG C; 3, under the condition of the step 2, dry hot gas is instantly injected into the shaping furnace, and the obtained nitrile group type carbon fiber precursors are shaped. The purposes that non-superior products generated in the existing carbon fiber precursor production process are reused, and waste and environmental pollution are reduced are achieved.

The invention discloses a hazard-free environment-friendly treatment process for reducing and recycling waste rubber, plastic and domestic garbage, which aims to solve the problem of difficulty in treatment of the waste rubber, the plastic and the domestic garbage. The process comprises the following steps of: classifying the waster rubber, the plastic and the domestic garbage, and putting into apyrolysis device and a waste heat boiler; feeding a gaseous product generated by the pyrolysis device into a separation device, and separating to obtain fuel oil and combustible gas; collecting a residual object, namely carbon black in the pyrolysis device; feeding the combustible gas into the pyrolysis device and the waste heat boiler for combustion; feeding flue gas exhausted from the waste heat boiler into a shock cooling device; and purifying by using a purification device, and emptying. The treatment process is easy to operate and control, pyrolysis and combustion are integrated, resources can be effectively recycled, and the problem of secondary pollution of waste gas and waste water is solved synchronously.