摘要:
Method for preventing fouling and corrosion caused by ammonium chloride and ammonium sulphates, characterised in that it comprises injecting as an additive a choline or a derivative thereof.
摘要:
Method for preventing fouling and corrosion caused by ammonium chloride and ammonium sulphates, characterised in that it comprises injecting as an additive a choline or a derivative thereof.
摘要:
Household appliance, in contact with an aqueous medium, having a water circuit at least partially traversing a compartment containing a disincrustant agent. The disincrustant agent is obtained by cross-linking or hardening of an organosilicic system having a disincrustant action. The system includes: an ingredient consisting of a polyorganosiloxane composition, hardenable into a siicone elastomer at room temperature or under the effect of a temperature greater than room temperature, at least partially cross-linked or not, permeable to water vapor, and an ingredient, which is hydrophilic and osmotically active, consisting of an active disincrustant material taken alone or in association with a hydrophilic auxiliary agent, dispersed in a homogenous manner within the silicone ingredient, the active disincrustant material being liberated over time, in an aqueous medium, out of the silicone ingredient hardened into elastomer, at a substantially constant rate when the temperature in the compartment is substantially constant.
摘要:
Disclosed is a process for reducing the fouling in a heat exchanger in which a hydrocarbon stream is heated or cooled as it passes through the heat exchanger. From 1 to 500 parts per million of an organic hydroxylamine is added to the stream to reduce fouling.
摘要:
An additive comprising at least one parting agent is added to a particle form evaporator to reduce the buildup of polymer on the walls and rotor of the agitated bed of the particle form evaporator. In an alternate embodiment, the additive employed further comprises at least one filler.
摘要:
A variety of coating resin latices may be deposited on metallic surfaces in the form of thin, pin hole-free polymer films from an alkaline latex comprising the coating latex, a cyanide salt and a water-soluble oxidizing agent. The coated substrates are resistant to fouling and to deposition of scale deposits when employed as heat transfer surfaces in cooling systems.
摘要:
Biofouling and scale control in conductive aqueous systems is effected on metal, preferably valve metal such as titanium, surfaces on which such fouling normally occurs by applying thereto a stable electrocatalytic coating, anodically polarizing said valve metal coating such that essentially only oxygen is evolved at the surface thereof, preferably at a rate of at least about 4.66 millimoles per square meter per hour without evolution of any chlorine. Periodic current reversal is effected to forestall biofouling upon any cathode utilized in implementing the instant invention.
摘要:
The invention refers to crystallization inhibitor compositions, which contain as the active component a copolymer of 4-vinyl pyridine and of acrylic acid esters, dispersed in an aqueous medium. They are suitable for use in paraffinic oils to prevent the deposition of solid paraffin on walls of containers and pipelines.While the known compositions which contain the same active component are not suitable for use under field conditions due to their high solidification temperature, the novel compositions can be used at temperatures as low as -15.degree. C. and the dispersions are quite stable on storage and have low viscosity.
摘要:
1. IN THE FREE-RADICAL POLYMERIZATION PROCESS FOR THE PRODUCTION OF POLYMERIZATES IN AN AQUEOUS DISPERSION CONTAINING AT LEAST 60% OF POLYVINYL CHLORIDE, WITH LOW POLYMER DEPOSITS, WHICH COMPRISES THE STEPS OF OIXING (1) MONOMERS SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND MIXTURES OF VINYL CHLORIDE WITH UP TO 40% BY WEIGHT OF OLEFINICALLY MONO-UNSATURATED COMPOUNDS COPOLYMERIZABLE WITH VINYL CHLORIDE, (2) A FREE-RADICALFORMING POLYMERIZATION CATALYST, (3) DISPERSION STABILIZERS SELECTED FROM THE GROUP CONSISTING OF PROTECTIVE COLLOIDS, EMULSIFIERS AND MIXTURES THEREOF, AND (49 WATER, HEATING SAID MIXTURE UNDER AGITATION TO A POLYMERIZATION TEMPERATURE OF BETWEEN 0* C. AND 80* C. AND RECOVERING SAID POLYMERIZATE, THE IMPROVEMENT WHICH CONSISTS IN CONDUCTING SAID POLYMERIZATION IN A CONFINED SPACE AND SPRAYING A FINE SPRAY OF WATER IN A TOTAL AMOUNT OF FROM 20% TO 100% BY VOLUME OF THE VOLUME OF SAID MONOMERS, ONTO THE EXPOSED SURFACE OF SAID CONFINED SPACE DURING THE PERIOD OF SAID POLYMERIZATION AND DURING ANY DISTILLATION OF UNREACTED MONOMERS FROM THE POLYMERIZATE DISPERSION, WHEREBY A POLYMERIZATE IS RECOVERED WITH LOW POLYMER DEPOSITS.