SU1104147A1 - Method of preventing depositing in equipment - Google Patents

Abstract

A METHOD FOR PREVENTING DEPOSITS IN THE EQUIPMENT in the processing of petroleum raw materials, including heating, by introducing into the raw material an inhibitor of thermal deposits - ammonia in the amount of 1-10 May. ppm, characterized in that, in order to reduce deposits, an inhibitor of thermal deposition is used, further comprising morpholine at an ammonia-morpholine mass ratio of 1:

Description

(L

with

four

The invention relates to the refining of oil using heat. Usually, when oil is heated, a near-wall liquid film is formed on the pipe walls, which provides tangible thermal resistance and reduces the heat transfer coefficient. In addition, when heated, heavy petroleum products prone to coke formation J1, which forms a sedentary liquid foam, at high temperatures, overheats and becomes a source of coke deposits on a hot metal surface. The apparatus must be disconnected prematurely for cleaning from coke. There is a known method of preventing deposits in the apparatus during the processing of hydrocarbon feedstock by introducing the inhibitor morpholine L. However, the method gives insufficient reduction of sediments. Closest to the present invention is a method of preventing deposits in the apparatus during the processing of petroleum feedstocks, including heating by the introduction of inhibitory into the raw materials. ammonia thermo deposition torus or an aqueous solution of ammonium compounds. The inhibitor is introduced into the raw material in an amount of 1-20 wt. h / m in terms of C2. However, in the implementation of the well-known method, insufficient inhibition of sediment is observed. The purpose of the invention is to reduce deposits in the equipment. This goal is achieved by a method of preventing deposits in the equipment in the processes of processing. ki of oil raw materials, including heating, by introducing into the raw material an inhibitor of thermal deposition — ammonia in the amount of 1-10 weight. h / m and additionally - morpholine at a mass ratio of ammonia: morpholine 1: (0.2-5). The choice of the specified ratio of ammonia and morpholine is due to the synergistic effect in this interval. Example 1. A 4 l / h oil is pumped through a heating tube equipped with an electric heater and heated to 300 ° C. The temperature at the outlet of the tube is measured and the heat transfer coefficient (K) is determined. Under the given conditions, a blank experiment and a series of experiments with the addition of ammonia as an inhibitor and morpholine were carried out both separately and together, in different ratios — 1: (0.2-5), respectively. The amount of sediments is judged by the value of the heat transfer coefficient (Table.- 1). At a temperature in the range of 275291 ° C, a noticeable thermal decomposition of the raw material and the formation of coke deposits in the tube, as with the addition of an inhibitor, was not observed without it. However, an increase in the heating temperature and heat transfer coefficient with the addition of the inhibitory composition (ammonia-morpholine) in comparison with the addition of ammonia or morpholine alone is obvious. Example 2 In contrast to example 1, the temperature at the exit of the tube is kept constant, equal to 450 ° C, regulating the degree of heating of the electric coil. When the pressure at the inlet to the tube rises to 20 atm, as a result of its coking, the experiment is stopped. The duration of the run from the moment of reaching the specified mode to the pressure increase at the inlet of the tube up to 20 bar is determined. In tab. 2 shows the results obtained. It can be seen from the above example that at the same temperature at the outlet of the heating tube due to a decrease in coke deposition, the run time with the introduction of the inhibitor composition ammonia-morpholine is higher than with the introduction of the same amount of ammonia or morpholine alone. The duration of the run increases with an increase in the amount of the additive. Therefore, the proposed method achieves an improvement in heat transfer from the pipe wall to the raw material due to a decrease in coke deposits on the pipe walls, an increase in the running time of the heat exchanging equipment, as well as a reduction in the energy consumption required to create the desired temperature by the process flow.

1.0 10.0 20.0

2.0 10.0 20.0

5.0

1.0

2.0

1.0

10.0 10.0

2.0

10.0 50.0

10.0

Table 1

283

275 277 320 283 354 285 358 354 283 365 284 286 370

1: 5,286,390,384,285

1: 2

0.0 483 292

1: 1

2.0 286 400

1: 0,2

0.0 480

1: 5,291

Table 2

Continued table. 2

Claims (1)

METHOD FOR PREVENTING SEDIMENTS IN EQUIPMENT in oil refining processes, including heating, by introducing thermal deposition inhibitor - ammonia in the amount of May 1-10. ppm ", characterized in that, in order to reduce deposits, use a thermal deposition inhibitor, additionally containing morpholine with a mass ratio of ammonia and morpholine 1: (0.2-5). 1 104147