174results about "Distillation corrosion inhibition" patented technology

Hydrocarbons, gas mixtures of hydrocarbons, and the like containing hydrogen sulfide are brought into intimate contact with a hydrogen sulfide scavenger prepared by reacting an alkylenepolyamine with formaldehyde, whereby the amount of hydrogen sulfide in the hydrocarbon is significantly reduced.

A composition and method of inhibiting corrosion caused by naphthenic acid in fluids includes using a combination of a thiophosphorus compound and a hydrogen sulfide scavenging compound. The hydrogen sulfide scavenging compound significantly enhances the performance of the thiophosphorus compound and may be included at relatively low levels in the composition. The treatment may be applied to fluids including crude oils and lighter fractions thereof.

The present invention is a method for mitigating the fouling from thermally cracked oils by minimizing the residence time at the temperature when the fouling is highest.

A method of reducing hydrolysis in a hydrocarbon stream comprising adding to a hydrocarbon stream containing a chloride compound which undergoes hydrolysis at elevated temperatures in the presence of water to form hydrochloric acid, an effective amount of a treating agent that is at least one overbased complex of a metal salt and an organic acid complexing agent, the treating agent being added to hydrocarbon stream when the stream is at a temperature below which any substantial hydrolysis of the chloride containing compound occurs.

Amine and amine blend compositions neutralize acid environments in distillation overheads of hydrocarbon processing facilities. The neutralizers are composed of certain combinations of amines which are relatively stronger bases and more resistant to hydrochloride salt formation. The amines, when blended together, provide greater neutralization of condensed water present without increased potential for corrosive hydrochloride salt formation.

A method for inhibiting and dissolving the deposits formed on caustic or alkaline scrubbers used in scrubbing acidic gases such as carbon dioxide, hydrogen sulfide, which are formed during the pyrolytic cracking of naphtha, ethane, and propane. The cracking operations produce certain oxygenated compounds such as vinyl acetate or acetaldehyde, which undergo polymerization under alkaline condition. The vinyl acetate on hydrolysis releases acetaldehyde under alkaline conditions. Amino acids such as 6 amino caproic acid and lactams such as epsilon caprolactam not only prevent but also dissolve the polymers formed by aldol condensation.

The present invention discloses a process for treating salt deposition in a fractionating tower. A purpose of the present invention is to overcome disadvantages of time consuming, device shutdown or amount reducing, hidden danger of corrosion, and the like in the prior art, wherein the amount is the amount of the deposited salt. The method comprises that: a salt deposition inhibitor is consecutively added to the an oil product before the oil product enters a tower top reflux pipeline of the fractionating tower or a tower top circulating pump inlet of the fractionating tower, wherein 30-60 mg of the salt deposition inhibitor is added to per kg of the oil product in the tower top reflux pipeline of the fractionating tower or the tower top circulating pump inlet of the fractionating tower, the adding time is 30-60 hours, the salt deposition inhibitor comprises, by weight, 30-70% of an aliphatic nitrogen compound, 10-30% of alkyl alcohol and 20-40% of an organic solvent.

The present invention relates to the field of inhibition of metal corrosion in hot acidic hydrocarbons, wherein acidity is derived from presence of naphthenic acid. More particularly, it relates to a polymeric additive for inhibiting high temperature napthenic acid corrosion, wherein said polymeric additive is polymeric phosphate ester of polyisobutylene succinate ester or oxide derivative of polymeric phosphate ester of polyisobutylene succinate ester. A polymeric phosphate ester of polyisobutylene succinate ester which is capable of acting as naphthenic acid corrosion inhibitor by inhibiting naphthenic acid corrosion in crude oil/feedstock/hydrocarbon streams containing naphthenic acid, and demonstrating higher thermal stability at elevated temperature varying from about 200° C. to about 400° C. [about 400° F. to about 750° F.] is disclosed.

The invention discloses a method for preventing a fractionating tower from salt deposition, which belongs to the technical field of petrochemical industry and is used for solving the salt deposition problem on the upper part of a fractionating tower. The upper part of the fractionating tower is provided with appliances such as a separating member tower board, a filler or an oil collection tank. According to the method, the oil collection tank and a dewatering apparatus are arranged on the lower part of the water-containing section separating member of the upper part of the fractionating tower in order to drain the liquid-phase water out of the tower, thereby thoroughly solving the salt deposition problem on the upper part of the fractionating tower.

A method of optimizing system parameters in a crude unit to reduce corrosion and corrosion byproduct deposition in the crude unit is disclosed and claimed. The method includes measuring or predicting properties associated with the system parameters and using an automated controller to analyze the properties to cause adjustments in the chemical program to optimize the system parameters. Adjusting the system parameters effectively controls corrosion in the crude unit by reducing the corrosiveness of a fluid in the process stream and/or by protecting the system from a potentially corrosive substance. System parameter sensing probes are arranged at one or more locations in the process stream to allow accurate monitoring of the system parameters in the crude unit.

[Task] To provide a crude treatment system capable of treating crude containing a comparatively large content of a corrosive material.

[Means for Resolution] A primary distillation tower 11 fractionates first crude into a target fraction. A secondary distillation tower 21 which fractionates second crude having a corrosive material content greater than that of the first crude into a light fraction of which the content of the corrosive material is an amount not causing corrosion in the primary distillation tower 11 and a heavy fraction as the remainder thereof. Also, a light fraction supply line supplies the light fraction from the secondary distillation tower 21 to the primary distillation tower 11 so as to treat the light fraction in the primary distillation tower 11. Here, the secondary distillation tower 21 and the supply line for supplying second crude to the secondary distillation tower 21 are made from a material having corrosion resistance with respect to the corrosive material under circumstances in which the secondary distillation tower 21 and the supply line contact with the second crude and the heavy fraction.

The present invention relates to the field of processing hydrocarbons which causes corrosion in the metal surfaces of processing units. The invention addresses the technical problem of high temperature naphthenic acid corrosion and sulphur corrosion and provides a solution to inhibit these types of corrosion. The three combination compositions are formed by two mixtures separately, with one mixture obtained by mixing compound A, which is obtained by reacting high reactive polyisobutylene (HRPIB) with phosphorous pentasulphide in presence of catalytic amount of sulphur with compound B which is thiophosphorous compound such as phosphorous thioacid ester of Formula (1) and second mixture obtained by mixing compound A with compound C of Formula (2) which is obtained by reacting compound B with ethylene oxide, wherein each of these two mixtures independently provide high corrosion inhibition efficiency in case of high temperature naphthenic acid corrosion inhibition and sulphur corrosion inhibition. The invention is useful in all hydrocarbon processing units, such as, refineries, distillation columns and other petrochemical industries.

Alloy compositions which are resistant to metal dusting corrosion are provided by the present invention. Also provided are methods for preventing metal dusting on metal surfaces exposed to carbon supersaturated environments. The alloy compositions include an alloy (PQR), and a multi-layer oxide film on the surface of the alloy (PQR). The alloy (PQR) includes a metal (P) selected from the group consisting of Fe, Ni, Co, and mixtures thereof, an alloying metal (Q) comprising Cr, Mn, and either Al, Si, or Al/Si, and an alloying element (R). When the alloying metal (Q) includes Al, the multi-layer oxide film on the surface of the alloy includes at least three oxide layers. When the alloying metal (Q) includes Si, the multi-layer oxide film on the surface of the alloy (PQR) includes at least four oxide layers. When the alloying metal (Q) includes Al and Si, the multi-layer oxide film on the surface of the alloy (PQR) includes at least three oxide layers. The multi-layer oxide film is formed in situ during use of the alloy composition in a carbon supersaturated metal dusting environment. Advantages exhibited by the disclosed alloy compositions include improved metal dusting corrosion resistance at high temperatures in carbon-supersaturated environments having relatively low oxygen partial pressures. The disclosed alloy compositions are suitable for use as the inner surfaces in reactor systems and refinery apparatus.

Heat exchanger fouling in organic chemical production processes may be reduced using an antifoulant additive. The antifoulant additive may have one component selected from the group consisting of an alkylphosphate ester, and an alpha olefin maleic anhydride copolymer; or it may have two components selected from the group consisting of a metallic overbase, an alkylphosphate ester, and an alpha olefin maleic anhydride copolymer, wherein at least one of the two components in not an overbase. An additive having three components: a metallic overbase, an alkylphosphate ester, and an alpha olefin maleic anhydride copolymer; is also within the scope of the disclosure. The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b)

The invention relates to an online cleaning method of deposited salt of a tower tray of a normal-pressure tower. Particularly, the method comprises the following steps that: based on the original process, a cleaning pipeline is bridged between the input end of an overhead backflow regulating valve and the output end of an electro-desalting water injection regulating valve, and is provided with a bridging valve; by temporary process of communicating the bridged cleaning pipeline and an electro-desalting water injection pump and adjustment of a series of operating parameters, the temperature from the normal-pressure tower top to the tower tray of a normal-first-line pumping section is controlled to 90-100 DEG C, the normal-pressure tower top is driven into washing water, the washing water is pumped after reaching a normal-first-line distillate outlet, hot water is used for washing the tower tray of a salt depositing section continuously so as to solve the desalting problem of the deposited salt of a tower plate of the normal-pressure tower. Since the washing temperature is maintained to be constant by controlling technological parameters and the salt solubility is larger than normaltemperature, the deposited salt of the tower tray is dissolved and washed thoroughly, the device is guaranteed not to be stopped, and the whole online salt-washing treatment process needs about 8 hours; and therefore, the online cleaning method greatly shortens the treatment time, saves cost for starting and stopping the device, and furthest reduces the influence on normal production of an enterprise.

A method of correcting measurements of a chemical sensor used in an industrial facility. The method involves correcting for errors known to occur in the steady state and the dynamic state for specifically recognized situations. This method allows for correcting errors that occur due to deadtime, false zero measurements, and non-linear disturbances. The method combines automated measurement techniques and human know how to progressively learn and refine the accuracy of the corrections.