70 results about "Oxidation test" patented technology

The present invention relates to a high-temperature steam oxidation experimental device, and comprises a processing subsystem which can remove oxygen in water, an oxidative experiment subsystem and awater recovering subsystem. The processing subsystem which can remove oxygen in water comprises a water processing bucket which is connected with a vacuum pump. The lower end of the water processing bucket is provided with an oxygen removing tube which is connected with an inert gas bottle. The upper part and the lower part of the water processing bucket are all connected with the upper part and the lower part of the water storage bucket of the oxidative experiment subsystem. The lower part of the water storage bucket is connected with the steam generating preheating furnace of the water recovering subsystem via a pipeline and a valve. A metering pump is arranged on the pipeline. The steam generating preheating furnace is also connected with a reacting furnace which is provided with a steamoutlet. The processing subsystem which can remove oxygen in water of the present invention can adjust the content of dissolved oxygen in the experiment water. The other quality parameter of the exper iment water can be adjusted through controlling the water quality. The flowing amount of the steam can be adjusted via the metering pump of the oxidative experiment subsystem. The steam temperature ofthe oxidative experiment can be adjusted by changing the setting temperature of the steam generating preheating furnace and the reacting furnace.

A method for improving the oxidation stability of an ashless hydraulic fluid or an ashless paper machine oil, comprising:a. selecting a base oil having greater than 90 wt % saturates, less than 10 wt % aromatics, a base oil viscosity index greater than 120, less than 0.03 wt % sulfur, a sequential number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a ratio of molecules with monocycloparaffinic functionality to molecules with multicycloparaffinic functionality greater than 2.1; andb. replacing a portion of an original base oil in the ashless oil with the selected base oil to produce an improved ashless lubricating oil; wherein the improved ashless lubricating oil has a result in the rotary pressure vessel oxidation test that is at least 50 minutes greater than the result in the rotary pressure oxidation test of the ashless hydraulic fluid or ashless paper machine oil.

Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg / cm2 or less, and having an amount of scale spallation of 1.0 mg / cm2 or less.

A device and a method for an accelerated oxidation test of fuels or petroleum products, as well as a computer program for controlling such a device, and a corresponding computer readable storage medium, which are applicable, in particular, for the simulation of the aging of fuels or petroleum products. A device for an accelerated oxidation test of fuels or petroleum products is proposed, whereby the device comprises of a pressure vessel (1) to hold specimen (2) of fuels or petroleum products, and the pressure vessel (1) contains at least one device to change the temperature. A corresponding method provides that a specimen (2) of fuel or petroleum product is placed in a pressure vessel (1), the specimen is brought to a predefined temperature above 100° C. by at least one device to change the temperature, which is placed in the pressure vessel (1) and / or in the specimen (2), and the absolute pressure value is monitored so as to determine the oxidation.

The invention discloses a preparation method of a high-temperature antioxidant for lubricating oil, which uses 2,6-di-tert-butylphenol and substituted diphenylamine as raw materials, uses n-decane as a high-boiling solvent, and acts as a catalyst under an inert gas atmosphere. React at 120-170°C for 2-4 hours, and the product is post-processed to obtain the target product. The invention uses an antioxidant with excellent high-temperature anti-oxidation ability to replace diphenylamine and 2,6-di-tert-butylphenol to react, and can greatly prolong the working time of the lubricating oil under the condition of increasing the use temperature of the antioxidant. The product of the invention has the advantages of high temperature resistance, strong oxygen resistance, good solubility in lubricating oil, etc.; the high temperature and oxygen resistance test of lubricating oil proves that it has excellent performance and has broad application prospects.