RU2813187C1 - Method for reducing sulphur in petroleum products - Google Patents

Abstract

FIELD: sulphur reduction.

SUBSTANCE: invention relates to methods for reducing sulphur in crude oil and can be used in the petrochemical, oil production, oil and gas and oil refining industries. The invention relates to a method for reducing sulphur in petroleum products, which uses a reagent mixed with the feedstock to obtain a homogeneous mixture, which is supplied to the reactor, where it is processed together with ferromagnetic elements in a rotating electromagnetic field, and then goes to separation to separate ferromagnetic particles, water and sedimentation. The reagent used is a 20% solution of hydrogen peroxide in an amount of 20% of the volume of the feedstock, which is homogenized with the feedstock when heated to 60°C in a buffer tank, then the homogeneous mixture is fed into the reactor, where it is processed under the influence of ferromagnetic elements, then it is moved to sediment and compact foreign bodies and excess water into successively located sedimentation tanks.

EFFECT: reduction in the level of resource and energy consumption, an increase in the degree of purification of petroleum products from sulphur.

1 cl, 1 tbl, 2 dwg

Description

The invention relates to methods for reducing sulfur in crude oil and can be used in the petrochemical, oil production, oil and gas and oil refining industries.

There is a known method for purifying petroleum products from sulfur impurities [RF Patent No. 2312884 C1. G10G 25/05 (2006.01). A method for purifying petroleum products from sulfur impurities. This method is characterized by the fact that the process of purifying petroleum products from sulfur impurities is carried out in a centrifugal field by joint rotation of the dispersion mixture of the adsorbent and the original petroleum products.

Mass ratio of the dispersion mixture of the adsorbent and the original petroleum products (1.0-2.0): 1.0. Rotation is carried out in the rotor-drum when a vertical electric field of intensity E = 1000-15000 V/m is applied to the mixture of adsorbent and petroleum products, with a continuous flow of adsorbent and petroleum products into the rotating rotor-drum in the specified mass ratio, at a rotation speed of the rotor-drum of 60- 2500 rpm The adsorbent and petroleum products are continuously drained through the outer side of the rotor-drum into a container, from which the purified petroleum products are sent to the consumer, and the adsorbent is sent for regeneration and reuse.

The holding time of the transverse layer of the mixture of sorbent and petroleum products, moving from the center to the periphery of the rotor-drum, is 10-30 minutes.

The disadvantage of this known method is low productivity due to the long residence time of the mixture of petroleum products and adsorbent in the rotor-drum.

The closest to the claimed method in its essence and the achieved technical result, chosen as a prototype, is a method for reducing the total sulfur content in oil or fuel oil [RF Patent No. 2734413 C1. C10G 32/02 (2006.01). A method for reducing the total sulfur content in oil or fuel oil. The method is characterized by the fact that ferromagnetic liquid is used as a reagent, taken in an amount of no more than 5% of the total volume. The feedstock and ferromagnetic fluid are mixed to form a homogeneous mixture. The resulting homogeneous mixture is fed for processing into a reactor with ferromagnetic elements inside it, and rotation of the homogeneous mixture (raw materials and ferromagnetic liquid) together with ferromagnetic elements in a rotating electromagnetic field is ensured.

The electromagnetic field is characterized by a frequency of 50 Hz of a three-phase alternating current network with a voltage of 380 volts, a magnetic induction in the working zone of the reactor of 0.9-1.1 T and at a speed of ferromagnetic elements in the reaction zone of up to 3000 per minute inclusive. The processing of a homogeneous mixture in a rotating electromagnetic field is carried out over a period of time in the range of 4–5 seconds; during the processing of a homogeneous mixture, excess water is simultaneously supplied to the reaction zone in an amount of no more than 20% of the total volume.

After processing the homogeneous mixture in a rotating electromagnetic field, it is fed to separation to separate ferromagnetic nanoparticles, water and sediment.

The following set of features of the prototype coincides with the essential features of the invention: a method for reducing the mass fraction of sulfur in petroleum products, which uses a reagent mixed with the feedstock to obtain a homogeneous mixture, which is fed into the reactor, where it is processed, together with ferromagnetic elements, in a rotating electromagnetic field and then goes to separation to separate ferromagnetic particles, water and sediment.

The disadvantage of this method is the high level of resource and energy consumption. This is due to the high cost of ferromagnetic fluid.

The task to which the invention is aimed is to reduce the level of resource and energy consumption, increase the degree of purification of petroleum products from sulfur by preheating the mixture being processed.

The solution to the problem is provided by the method of reducing sulfur in petroleum products, in which a reagent is used, mixed with the feedstock to obtain a homogeneous mixture, which is fed into the reactor, where it is processed, together with ferromagnetic elements, in a rotating electromagnetic field and then goes to separation for separation of ferromagnetic particles, water and sediment.

In the proposed solution, a 20% solution of hydrogen peroxide is used as a reagent in an amount of 20% of the volume of the feedstock, which is homogenized with the feedstock when heated to 60°C in a buffer tank, then the homogeneous mixture is fed into the reactor, where it is processed under the influence of ferromagnetic elements, then moves to settle and compact foreign bodies and excess water into successively located sedimentation tanks.

The use of a 20% hydrogen peroxide solution as a reagent in an amount of 20% of the total volume directly reduces the cost of the process due to the low cost of the reagent.

Heating a homogeneous mixture in a buffer tank to 60°C reduces the viscosity of the mixture. This reduces the amount of energy required to move the mixture to the next stage of processing, which also reduces costs.

The percentage composition given in the claims and description (a twenty percent solution of hydrogen peroxide and its content in an amount of 20% of the total volume) is optimal and was confirmed during experimental production research at the Educational and Research Laboratory “Innovative Vibration Technologies and Machines” of BSTU. V.G. Shukhova

Thus, the combination of distinctive features of the proposed solution will ensure a reduction in the cost of the proposed method.

The essence of the invention is illustrated by graphic material.

Figure 1 shows a schematic diagram of the method;

Figure 2 shows the sequence of arrangement of devices in the complex for implementing the method

The complex for implementing the method contains a reagent preparation container 1, in which the hydrogen peroxide solution is accumulated and diluted with water to a concentration of 20%, a storage container 2, in which petroleum products (feedstock) are stored, a thermal homogenizer 3, in which the reagent is mixed with feedstock and heating the homogenized mixture to 60°C reactor 4, in the working area of which ferromagnetic elements act on the homogenized mixture, continuous sedimentation tanks 5, in which sedimentation and compaction of foreign bodies and excess water occurs.

Reduction of sulfur in petroleum products in petroleum products is carried out as follows.

The reagent is first prepared by diluting hydrogen peroxide with water to a hydrogen peroxide concentration of 20%. The preparation process is carried out in container 1, the preparation of the reagent, in which mixing blades are installed to ensure the homogeneity of the reagent.

At the next stage, homogenization of the initial mixture and reagent is performed, for example, oil and reagent - 20% hydrogen peroxide. From the storage tank 2, the feedstock is supplied using a pump to the thermal homogenizer 3. At the same time, a 20% solution of hydrogen peroxide in the amount of 20% of the total volume is dosed into the homogenizer 3 from tank 1.

Homogenization is carried out in homogenizer 3 with constant heating of the mixture to 60°C. The heating process occurs due to the heating element; temperature maintenance is controlled by a sensor.

Then the homogenized mixture is exposed to ferromagnetic elements, which leads to the activation of processes and the acceleration of reactions. This process takes place in the working zone of the reactor 4, where the homogenized mixture from the homogenizer 3 is transferred using a pump.

After treatment in the reactor, the treated mixture is subject to the precipitation and compaction of foreign bodies, as well as excess water. In addition, due to the release of sulfur dioxide, the mass fraction of sulfur decreases. These processes are carried out in block 5 of sedimentation tanks. The block consists of three sedimentation tanks of a cylindrical-conical shape. The treated mixture is fed to the lower part of the settling tank, gradually rising to the level of the outlet pipe. During the lifting process, excess water is separated from the mixture and falls to the bottom, into the conical part of the settling tank, from where it is removed by a pump. The settling tanks are located in series, with the inlet pipe of each settling tank located above the axis of the outlet pipe. The inlet pipe is made in the form of a pipe, which goes inside the sump and, with the help of a rotating elbow, is lowered down the sump. This principle is implemented in all 3 settling tanks, which, when passing them alternately, allows for complete separation of excess water from oil products. The outlet pipe of the 3rd settling tank is connected to a storage tank into which the finished product flows.

The sulfur content in the treated oil was studied using X-ray luminescence dispersive spectrometry, the results are displayed in table. 1.

Table 1.

Sulfur content in treated oil at different temperatures

No. Initial sulfur content Sulfur content after treatment Temperature of the mixture being processed 1 1.74% 0.95% 56°С 2 1.74% 0.93% 57°С 3 1.74% 0.91% 58°С 4 1.74% 0.89% 59°С 5 1.74% 0.86% 60°C 6 1.74% 0.86% 61°C 7 1.74% 0.86% 62°C

Thus, when implementing the proposed method, the problem is solved - increasing the degree of purification of petroleum products from sulfur, reducing costs through the use of an inexpensive reagent and reducing energy costs when moving a homogenized medium.

In addition, the proposed method is low-cost and has a simple design of a set of devices for its implementation.

Claims (1)

A method for reducing sulfur in petroleum products, which uses a reagent mixed with the feedstock to obtain a homogeneous mixture, which is fed into a reactor, where it is processed together with ferromagnetic elements in a rotating electromagnetic field, and then goes to separation to separate ferromagnetic particles, water and sediment, characterized in that the reagent is a 20% solution of hydrogen peroxide in an amount of 20% of the volume of the feedstock, which is homogenized with the feedstock when the buffer tank is heated to 60°C, then the homogeneous mixture is fed into the reactor, where it is processed under the influence of ferromagnetic elements, then moves to settle and compact foreign bodies and excess water into successively located sedimentation tanks.