Antichlor

Abstract: The utility model provides a system for performing on-line monitoring on residual chlorine in a fluid, which comprises a first residual chlorine detecting device, a second residual chlorine detecting device arranged at the downstream of the first residual chlorine detecting device, an antichlor adding device arranged between the first residual chlorine detecting device and the second residual chlorine detecting device, and a calculation and control device communicated with the first residual chlorine detecting device, the second residual chlorine detecting device and the antichlor adding device. By performing real-time on-line monitoring on the flow of the inlet water and the residual chlorine concentration, accurately performing on-line adding on sodium thiosulfate by a metering pump or a peristaltic pump, then performing on-line measurement on the residual chlorine concentration of the water added with chlorine, and performing feedback control on the adding quantity according to the residual chlorine concentration, the system of the utility model guarantees the residual chlorine in the water flowing through the devices stable between 0 and 0.02mg/L, and has the advantages of automatically, accurately, stably, rapidly removing the residual chlorine in the water in an on line mode and guaranteeing the concentration of the sodium thiosulfate can not generate harmful effects on the early-warning indicator organism.

Abstract: An investigation is described in which the effects of bleaching on the reflectance value and yellowness or colour difference of jute were studied. Different concentrations and pH values of solutions of bleaching powder, sodium hypochlorite, and a combination of bleaching powder and hydrogen peroxide were treated under different conditions. The bleached samples were also reduced with potassium borohydride and sodium hydrosulphite. Bleaching with bleaching powder at a fixed available-chlorine concentration (0.25%) at pH 10.5 for 20 min and then exhausting the bath is shown to work better than four successive treatments of 7.5 min each, followed by antichlor treatments. Even better, however, were samples that had been bleached with a combination of bleaching powder and hydrogen peroxide and subsequently reduced with potassium borohydride. Infra-red spectra showed that carbonyl groups resulting from the peroxide treatment disappeared after reduction with borohydride.

Abstract: The utility model discloses a fluorine and chlorine removal and recovery device used in a system for making acid by using copper smelting gas. The fluorine and chlorine removal and recovery device comprises a blast blower, a fluorine and chlorine removal tower, a waste acid trap, a fluorine and chlorine absorption tower and solid-liquid separation equipment, wherein an outlet of the blast blower is connected with a gas phase inlet of the fluorine and chlorine removal tower; the middle part inside the fluorine and chlorine removal tower is filled with a high-temperature-resistant polypropylene haier ring; the waste acid trap is arranged above the high-temperature-resistant polypropylene haier ring and above the inside of the fluorine and chlorine removal tower; a gas phase outlet of the fluorine and chlorine removal tower is connected with the fluorine and chlorine absorption tower; an absorbent of the fluorine and chlorine absorption tower is a calcium oxide and calcium chloride solution; the fluorine and chlorine absorption tower is connected with the solid-liquid separation equipment. By using the fluorine and chlorine removal and recovery device, the aim of removing fluorine and chlorine without adding any agents such as a fluorine removal agent, an antichlor and the like in a recovery process can be achieved, and the production cost can be reduced; the removed fluorine and chlorine can be recycled and prepared into calcium fluoride, so that the additional value of a product is relatively high, and the economical benefit is remarkable; fluorine is abandoned in the traditional fluorine removal process to cause resource waste and environmental pollution.

Abstract: When waste plastics that include chlorine-containing plastics, such as polyvinyl chloride (PVC), are used for a blast furnace, a chlorine-containing gas generated during pyrolysis may corrode the equipment. Then, the melt process mixed with PVC, polyethylene, polypropylene, polystyrene, coal tar (HOB) and Fe2O3 as the antichlor agents were examined to stabilize chlorine that was detached from PVC to form iron chloride. After the melt process, these were hydrocracked to produce oil. The result that chlorine was stabilized by iron oxide and formed iron chloride on the melt process was confirmed and reported. Subsequently, the influence of iron chloride on the hydorcracking process was examined. The following results were obtained;(1) FeCl2 and FeCl3 promote polymerization of the product, and chlorine, which is generated from FeCl3 by pyrolysis, is distributed in the product.(2) When Fe2O3 is added on the melt process excessively, the dispersion of chlorine can be controlled by Fe2O3 to fix chlorine generated from FeCl3.(3) However, it is necessary to remove the iron chloride before the hydrocracking process because they promote polymerization of the products.