SU1237228A1 - Method of controlling the process of stabilization of hydrogenisate - Google Patents

Description

The invention relates to the automation of the separation of petroleum products, in particular the process of stabilizing hydrotreated diesel fuel, and can be applied in the refining and other industrial zones.

The purpose of the invention is to reduce the unit cost of hydrogenate production.

Figure 1 is a block diagram of a control system implementing the proposed method; figure 2 shows the dependences between the physicochemical parameters of the process of stabilization of hydrogenate.

The method is carried out as follows.

Unstable hydrotreated diesel fuel heated to 170-250 ° C is fed to a distillation column on plate 7 or 13 to stabilize diesel fuel. From the top of the column, distillate vapors containing hydrogen sulfide are discharged into condenser - cooler 2, in which they condense and cool to AO C and enter separation into separator 3. Hydrocarbon gas with hydrogen sulfide is fed to hydrogen sulfide purification, and then into the fuel system of the furnace 4. Pressure in. the separator is maintained at a constant value by varying the flow rate of the hydrocarbon gas recovered from separator 3. Liquid distillation of the distillation column — distillate is removed from the bottom of the separator. A part of the distillate is returned as reflux to the column, the other part as a recirculating agent is discharged as an evaporating agent along with its raw material (unstable hydrotreated diesel). The distillate balance excess, which is a by-product of the stabilization process, is fed to the mono-ethylene purification. The reflux rate stabilizes at a certain value or varies with the temperature at the top of the column ((not shown), and the recirculated flow rate of the raw material suppressed into the pipeline is changed so that the target product withstands the corrosion test.

To determine the current recycle consumption, use the formula:

G Gp-l J

five

0

five

0

five

0

five

0

five

where GP is the recycle flow rate at d. GP is recycle flow rate; iC is the deviation of the hydrogen sulfide content from the permissible value; k ,, k - tuning factors.

Impact on the stabilization process in order to maintain the corrosion rate can also be carried out manually according to the results of corrosion tests, for example, on a copper plate.

The supply of recirculated to unstable hydrotreated diesel fuel leads to a proportional decrease in the partial pressure of hydrogen sulfide in the distillation column, which increases the driving force of the transition of hydrogen sulfide into the vapor phase and its extraction from diesel fuel.

As the recirculated flow rate increases (Fig. 2), both the flash point and the hydrogen sulfide content in the target product decrease. Since the main indicator is a corrosion indicator, the consumption of recirculation is adjusted as long as this indicator meets the established requirements. At the same time, there is practically no hydrogen sulfide in the target product. If, at the same time, the discharge temperature does not exceed the specified value (for example, for diesel and marine diesel engines not lower than 61 ° C, for general purpose diesel engines not lower than AO ° C), then the recirculation flow rate can be continued to increase, while the reserve for the extrusion temperature decreases. This leads to an increase in the yield of the whole product - a stable hydrotreated diesel fuel while reducing the normalized temperature points of its fractional composition due to a decrease in the consumption of distillate supplied to the mono-ethanol mixture, its octane number does not exceed 45 points by the motor method. This leads to a significant increase in the production of the target product and a corresponding reduction in the unit cost of its production and at the same time allows the end points of the fractional composition of the raw materials of the hydrotreating unit to be lost. The latter, in turn, leads to an increase in the selection of light oil products at the primary distillation units.

0 50 60 TO 80 90 100 no flash point

FIG g

f f,

Editor L. Pchelinska

Compiled by P. Koptev

Tehred V.Kadar Proofreader V.But ha

Order 3220/7 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR HYDROGENIZATION STABILIZATION PROCESS CONTROL on a distillation unit consisting of a distillation column, a condenser-cooler, a separator and pipes of a chat furnace, which consists in regulating the pressure in the separator by changing the flow rate of gas removed from the separator and the level in the distillation column cube by changing the flow rate of a stable hydro , the introduction of the evaporating agent in the distillation column and regulating its flow rate, characterized in that, in order to reduce unit costs and the production of hydrogenate, additionally recycle part of the distillate of the distillation column after the separator fed below or to the feed plate of the distillation column together with its raw material, measure the flash point of the stable hydrogenate and adjust the flow rate of the part of the distillate with a deviation from the set value with a correction for the rate of corrosion of the stable hydrogenate . S „., 1237228 A1 1 1237228