"NefteSintez-M" is a research and production enterprise, developer and manufacturer of reagents of the THIONOL and DE-XOC series
Our technology has found wide application both at the oil refineries and at the fields of Russia and Kazakhstan due to a high-quality and targeted approach, highly qualified specialists and many years of experience.
"NEFTESINTEZ-M" has been innovating in the field of oilfield chemistry for many years and has been collaborating with the Faculty of Chemistry of Moscow State University named after M.V. Lomonosov and the Skolkovo Innovation Fund.
The key direction of "NEFTESINTEZ-M" is the development and production of catalysts of the THIONOL and DE-XOC series.
"NEFTESINTEZ-M" takes a responsible approach to environmental issues and creates products, the use of which is waste-free and environmentally safe.
"NEFTESINTEZ-M" advocates the need to ban hydrogen sulfide scavengers based on formaldehyde (triazine).
THIONOL catalyst is used in the following processes:
The DE-XOC reagent is used in the following processes:
Removal of methyl and ethyl mercaptans from oil and condensate
For the removal of methyl and ethyl mercaptans, the most widely used are those or other options for alkaline treatment, in which large volumes of highly toxic sulfurous-alkaline wastewater that are difficult to dispose of are formed.
Such wastes are chemically contaminated and have high concentrations of toxicants in relatively small volumes. The toxicity of such effluents does not allow them to be discharged into water bodies or onto the ground, even after significant treatment, which is what is happening today.
Existing methods for neutralizing such waste are energy-consuming and environmentally unsafe. Therefore, in practice, the most common way to “utilize” SSS is underground burial, which in itself does not solve or even postpone the problem: toxic waste accumulates, contaminates groundwater and enters water intake systems. Irreparable harm is being done to aquatic ecosystems, nature and human health, which is simply impossible to assess.
Disadvantages of alkaline demercaptanization:
To remove hydrogen sulfide and light mercaptan, "Neftesintez-M" offers a reagent of the THIONOL series.
Reducing the content of active sulfur occurs directly in the hydrocarbon medium, by direct catalytic conversion of mercaptans RSH and hydrogen sulfide H₂S into disulfides.
The removal of mercaptans when using the THIONOL reagent occurs directly in the hydrocarbon medium, by dosing the reagent into the stream, unlike many known processes, it does not require the use of aqueous alkali, thus the process we offer is environmentally friendly and waste-free.
The technology is based on the use of THIONOL reagent, which has an advantage over such common processes as Merox (UOP), Mericat (Merichem).
Advantages of THIONOL reagent in relation to alkaline demercaptanization:
Removal of hydrogen sulfide from oil and condensate
The problem of reducing the content of hydrogen sulfide (H2S) in oil and oil products has recently become increasingly acute.
The following approaches are used to remove hydrogen sulfide from oil:
The key disadvantage of the first two methods is a rather high level of losses of commercial oil, since, together with hydrogen sulfide, a significant amount of light fractions is blown out of the oil, which reduces the quality of the oil.
The disadvantages of the most commonly used scavengers-neutralizers is the presence of formaldehyde in their composition, a chemical that is toxic and carcinogenic.
Formaldehyde is included in the list of carcinogenic substances GN 1.1.725-98 (a carcinogen is a chemical that, when exposed to the human body, increases the likelihood of malignant neoplasms).
For comparison, MPC r.z. formaldehyde 0.5 mg/m³, and the MPC for hydrogen sulfide is 20 times higher (MPC r.z. = 10 mg/m³).
Our company offers THIONOL catalyst for catalytic binding of hydrogen sulfide, the application of which does not require additional equipment and air supply to the oil stream.
The use of THIONOL catalyst is waste-free and environmentally friendly.
The proposed THIONOL catalytic oxidation catalyst has found its application both at refineries and at the fields of Russia and Kazakhstan.
Removal of hydrogen sulfide from water
Often, in the field, during the pressure maintenance process, a mixture of Cenomanian and formation water is used for injection into the bottomhole zone of the product reservoir. And in many cases, oil recovery is falling rapidly.
The cause of formation clogging is iron, which, when interacting with hydrogen sulfide, has the ability to release flakes ranging in size from 1 to 3 mm, concentrated in the capillaries and pores of the product zone.
The solution is to remove hydrogen sulfide from water with THIONOL to less than 2 ppm, thereby:
The consumption of THIONOL is 1 catalyst/1 H₂S. THIONOL S W101 is metal-free and can be used at any water pH. It's dissolve into water and oil. The reaction products are water-soluble sulfates. Does not cause corrosion, does not require special storage and safety conditions. Hazard class 3.
Correction of the indicator of the copper plate in petroleum products
Copper plate corrosion is a qualitative assessment of the corrosivity of an oil product on a plate made of pure copper. Tests are carried out in accordance with GOST 6321-92 or ASTM D130. The test method consists in keeping a copper plate in an oil product at an elevated temperature and fixing the change in its appearance, which characterizes the corrosive effect.
The corrosive activity of fuels is determined by the presence in them of compounds containing sulfur and oxygen. Such compounds can be contained in oil and get into fractions during distillation, but oxygen-containing compounds, including organic acids, can be formed during the oxidation of organic compounds during storage. In addition, the presence of impurities of mineral acids and alkalis is not ruled out in the fuel, which, when the fuel is watered during transportation and storage, makes the fuel especially corrosive.
List of corrosive components contained in hydrocarbon fractions:
In order to bring any type of fuel to class 1-A in terms of "Test on a copper plate" GOST 6321, THIONOL series reagents allow you to remove all types of corrosive components present in hydrocarbon fractions. THIONOL reagent is available in water or oil soluble form.
For each type of hydrocarbon feedstock containing certain corrosion-aggressive components (or a mixture of these components), a strictly defined version of the THIONOL reagent is selected, which makes it possible to purposefully combat the indicated causes of corrosion.
To establish the causes of corrosion for each type of hydrocarbon fraction, a detailed laboratory analysis is required to determine the causes of corrosion.
Removal of organochlorine compounds from oil
The DE-XOC reagent is aimed at solving the problem of removing organochlorine compounds from oil. The technology involves the addition of a specially designed reagent to crude oil in a certain ratio (from 5 to 10 mass parts per mass part of organic chlorine), during which the conversion of organochlorine compounds into inorganic chlorides (chloride salts) occurs, which can be further removed by washing with water . The key element of the proposed solution is mild reaction conditions (10-40°C), which allows the reagent to be used in oil fields without special equipment and changing the existing technological regime.
The innovative approach lies in the use of special catalysts in combination with a nucleophilic reagent. It should be noted that existing alkali treatment technologies assume a similar chemistry, in which organochlorine compounds react with a nucleophilic reagent to form a stable and safe organic product and an inorganic chloride. However, the use of hydroxide ion as a nucleophilic reagent requires high temperatures (80°C and above) and a long reaction time, which is often unattainable in oil fields and is associated with the need for capital costs, as well as high operating costs for such purification. This is due to the relatively low nucleophilicity of the hydroxide ion.
The DE-XOC reagent also reacts according to the nucleophilic substitution reaction and contains a nucleophilic organic compound, however, it is much more active than the hydroxide ion, which makes it possible to reduce the required reaction temperature compared to analogues. And the use of a strong nucleophilic compound in combination with a catalyst allows the process to be carried out already at a low temperature and in a short time, making it easy to introduce this technology into the oil preparation process of any oil producing facility.
Thus, among the key advantages of the DE-XOC reagent, it should be noted:
Chemical transformations of organochlorine compounds can be conditionally reflected in the following scheme:
As a result of the reaction, a stable organic compound R-Nu is formed, which does not contain chlorine, and also a common NaCl salt is formed, which can additionally be easily removed by washing with water.
The need to ban hydrogen sulfide scavengers based on formaldehyde (triazine)
The reagents produced by "NEFTESINTEZ-M" do not contain formaldehyde (triazine) in their composition, unlike other hydrogen sulfide absorbers.
The key disadvantage of produced hydrogen sulfide absorbers based on formaldehyde (triazine) is the reaction products - tritiane and polymethylene sulfides prone to the formation of insoluble polymers that form hard-to-remove deposits in pipelines and tanks.
Thiopolymers are insoluble substances that accumulate in tanks and pipelines as hard-to-remove deposits. To remove such deposits, special treatment using concentrated sulfuric acid is necessary.
Subsoil users are tired of testing the same active substance - formalin, but with a different trade name.
Currently, hydrogen sulfide neutralizers that have been analyzed for the absence of deposits formed due to the interaction of formaldehyde and hydrogen sulfide are allowed for laboratory testing!
VNII NP developed a “Method for obtaining deposits formed due to the interaction of formaldehyde and hydrogen sulfide” in 2016.
Formaldehyde in oil interacts with hydrogen sulfide in a rather complex way, forming, in addition to relatively light products (thioformalin), polymers based on thiazines and dithianes. Thus, the original hydrogen sulfide from oil, in the end, does not disappear anywhere, but remains in a bound form in oil as part of thiopolymers. In the case of a high content of hydrogen sulfide in oil, the amount of such thiopolymers can be significant.
If we take into account that the H2S content in the original oil can reach 1000 ppm (0.1%), then despite the different stages of oil preparation (desalting, CDU), a significant amount of sulfur-containing compounds can reach distillation columns.