MECHANISM FOR OBTAINING IMPORTED SUBSTITUTE ODORANT BASED ON DOMESTIC RAW MATERIALS

ABSTRACT

Odorant is added to natural combustible gases transported through the main pipeline in gas treatment plants, compressor stations in order to give them a special smell. By localizing this substance imported from abroad, it is possible to reduce the cost of gas odorization. This research paper describes the mechanism of obtaining an odorant from a stable condensate.

АННОТАЦИЯ

В природные горючие газы, транспортируемый по магистральному трубопроводу, добавляют одорант в установках подготовки газа, компрессорных станциях с целью придания им особого запаха. За счет локализации этого вещества, импортируемого из-за рубежа, можно снизить затраты на одоризацию газа. В данной исследовательской работе описан механизм получения одоранта из состава стабильного  конденсата.

Keywords: condensate, natural gas, odorant, mercaptan, alkali, extraction, distillation, mixture.

Ключевые слова: конденсат, природный газ, одорант, меркаптан, щелочь, экстракция, дистилляция, смесь.

Introduction

In the oil and gas industry, when processing hydrocarbon raw materials, a sufficient amount of organic sulfur compounds is formed, which have a strong special odor. These compounds will be considered waste of production, on the basis of which it will be possible to obtain odorants of a new composition. In the gas supply, odorant is added to it from the need for a special odor to natural gas before delivery. To date, odorants used in gas supply are imported from the Russian Federation. This, in turn, is the reason for the increase in gas supply costs and gas prices. We conducted research on the solution of this urgent issue and conducted research on obtaining an odorant that could replace imports based on local raw materials.

Materials

Odorant is a sulfur-based compound-ethyltionate. By composition, odorants can be divided into:

• sulfidnie (diethylsulfide, dimethylsulfide, tetragyrotiophene);
• mercaptali (captain, methylmercaptan, ethylmercaptan).

Odorant can be introduced into the gas stream in a liquid and vaporized state. The transfer of odorant to the gas pipeline in a liquid state is carried out using a dropper or a normalizing pump. On its basis, the constant value of the mass of one drop of the liquid (for the odorant, the mass of one drop is considered to be 0.02 g, that is, there are about 50 drops in 1 g of odorant) [4].

By controlling the odorant transmission and calculating the number of drops per unit of time, it is possible to find the required odorant consumption for the installed amount of gas consumption. At high gas consumption, the duration of odorant drops is converted into fluid flow. [1,2].

In terms of technical characteristics, the odorant to be added to the gas flow must meet the following requirements (Table 1):

Table 1.

Technical characteristics of odorant

Also, the odorant must comply with the requirements listed in Table 2 in terms of quality indicators [3,4].

Table 2.

Odorant quality indicators

The condensate is produced from the gas content of the primary treatment facilities of gas fields (Somontepa, Dengizkol, Ortabulok) with a relatively high content of sulfur compounds from our local fields. The released condensate is unstable and contains a mixture of light volatile hydrocarbon components and mercaptans. Degassing processes are carried out to stabilize unstable condensate [4].

The starting raw material of the Odorant intake device is condensate, which is separated from the gas composition and stabilized. Its chemical composition is given in the table below (Table 3):

Table 3.

Stable condensate chemical composition

Methods

In the processes of gas preparation, a mixture of mercaptans will also be present in the condensate separated from the gas composition Based on the technology of alkaline purification of hydrocarbon raw materials from mercaptans, two main reactions lie in the formation of sodium mercaptides in the interaction of mercaptans with toxic sodium [1-4]:

RSH + NaOH ↔ RSNa + H₂O

Regeneration of alkali in desorption process:

2RSNa +  H₂O ↔ RSSR + 2NaOH

Results

A sample of the resulting mixture of mercaptans was taken, the composition of which was studied according to GOST 2177 method A. The composition of the mixture of mercaptans obtained as a result of the research carried out was studied. The results of the study are presented in Table 4 below:

Table 4.

The composition of the resulting mixture of mercaptans

Analysis of results

The odorant Kagan, obtained on the basis of a mixture of mercaptans in the composition of stable condensates of our local deposits, was experimentally tested at the main gas pipeline Department [4]. In doing so, it was found that the natural gas transmitted through the main pipeline was able to give a special smell to natural gas when using the odorant drip input method, and this fully corresponds to the requirements for combustible natural gases directed to the main pipelines.

Conclusion

As a result of this research work, it was possible to improve the quality of stable condensates with sulfur compounds supplied to oil refineries and to produce imported substitute products based on domestic raw materials. Also, the service life of technological equipment in the processes of storage, transportation and processing of stable condensate is extended.

References:

1. Bekirov T.M., Lanchakov G.A. Technology processing gas and condensate-M.: OOO "Nedra-Biznestsentr", 1999. - 596p.
2. V.I. Murin and others. Processing of natural gas and condensate: Reference book: B2 h. - M .: Nedra-Business Center LLC, 2002. Part 1. - 517s.
3. Голубева И.А., Григорьевна Н.А., Жагфаров Ф.Г. Практикум по газохимии: Учебн.пособие/под ред. А.Л. Лапидуса – М.: РГУ нефти и газа, 2004. -143с.
4. Патент РФ № 2006130212/04, 21.08.2006. Способ получения одоранта // Патент России № 2317978. 2006. Бюл. № 6. / Иванов С.И., Михайленко С.А., Столыпин В.И. [и др.].