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Method for preparing liquid wax

A technology of liquid wax and paraffin, applied in the direction of refined hydrocarbon oil, petroleum industry, etc., can solve the problems of high energy consumption, complex process of isopropanol urea, consumption of chemical substances, etc., and achieve low energy consumption, short production cycle and high production process simple effect

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the isopropanol urea dewaxing process is that the process is complicated, the energy consumption is high, and there is consumption of chemical substances

Method used

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  • Method for preparing liquid wax

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Taking Daqing straight-run diesel oil as an example, the implementation process is as follows:

[0017] 1. The properties of raw materials are shown in Table 1.

[0018] Table 1 Properties of Daqing straight-run diesel oil

[0019] project experiment method Distillation range: GB / T6536 Initial boiling point, ℃ 220 98% distillation temperature, ℃ 310 Color, Saybolt +20 GB / T3555 N-paraffin content, % (mass) 42.6 Bromine value.gBr / 100g 3.5 SH / T0236 Sulfur, μg / g 300 SH / T0253 Flash point (closed mouth), ℃ 86 GB / T261 Water soluble acid and alkali none GB / T259 Moisture and mechanical impurities none

[0020] 2. Implementation process

[0021] (1) Weigh 9 kg of straight-run diesel oil with the properties shown in Table 1, add 50 μg / g of α-olefin (condensation point is 50°C, distillation range is within the range of 270°C to 335°C) and put it into the shell s...

Embodiment 2

[0025] Embodiment 2: Taking Shenbei straight-run diesel oil as an example, the implementation process is as follows:

[0026] 1. Raw material properties: as shown in Table 3.

[0027] Table 3 Properties of Shenbei straight-run diesel oil

[0028] project experiment method Distillation range: GB / T6536 Initial boiling point, ℃ 220 98% distillation temperature, ℃ 310 Color, Saybolt +20 GB / T3555 N-paraffin content, % (mass) 45.6 Bromine value.gBr / 100g 2.53 SH / T0236 Sulfur, μg / g 289 SH / T0253 Flash point (closed mouth), ℃ 89 GB / T261 Water soluble acid and alkali none GB / T259 Moisture and mechanical impurities none

[0029] 2. Implementation process

[0030] (1) Weigh 8.93 kg of straight-run diesel oil with the properties shown in Table 3, add 80 μg / g of pentaerythritol, and put it into the shell side of the sweat tank; (2) Start the water pump to circulate the refrigerant liqu...

Embodiment 3

[0034] Example 3: Taking Shenbei straight-run diesel oil as an example by adding an α-olefin mixture (with a freezing point of 52°C and a distillation range of 280°C to 340°C), the addition amount is 100 μg / g, and the implementation process is as follows:

[0035] 1. The properties of raw materials are shown in Table 3.

[0036] 2. Implementation process

[0037] (1) Weigh 9.25 kg of straight-run diesel oil with the properties shown in Table 3, add α-olefin mixture, stir well, and then put it into the shell side of the sweating tank; (2) Start the water pump to circulate the refrigerant liquid; (3) Start Refrigeration device, control the cooling rate of the high and low temperature salt water bath to 3°C / hour, so that the raw materials in the sweating tank will gradually crystallize; (4) When the temperature of the high and low temperature salt water bath drops to -20°C, keep the temperature constant for 6 hours, then slowly heat up, and then heat up The speed is 1°C / hour, so...

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Abstract

The invention discloses a method for preparing liquid wax. The method comprises the following steps: using straight run diesel oil fractions as raw materials, and adding an additive (alpha-alkene or pentaerythritol), wherein the adding amount of the additive is 50-2,000 mg / g; adopting a paraffin sweating tank connected with a circulating refrigeration / heating system, filling the raw materials containing the additive in the paraffin sweating tank, then starting a refrigeration system, cooling to 10 to -40 DEG C, wherein the temperature is lower than the freezing point of the liquid wax by 15-30 DEG C, and keeping the constant temperature for 4-8 h; starting a heating system to rise the temperature to be lower than the freezing point of the liquid wax by 3-10 DEG C, keeping the constant temperature for 1-8 h, rising the temperature and keeping the constant temperature, at the same time, discharging noncondensing liquid hydrocarbons from the paraffin sweating tank, and finally heating the paraffin sweating tank to melt a solid to be discharged to obtain the liquid wax product. Compared with the prior art, the method has the advantages of simple process, low energy consumption, no environmental pollution, and the like.

Description

technical field [0001] The invention relates to a preparation method of liquid wax. Background technique [0002] Liquid wax is normal alkanes separated from kerosene or diesel oil fractions. These normal alkanes are in a liquid state at room temperature, and they are usually called liquid paraffin, that is, liquid wax. The production methods of liquid wax mainly include two processes: molecular sieve dewaxing and isopropanol urea dewaxing. The molecular sieve dewaxing process refers to the use of molecular sieves as adsorbents to separate normal paraffins from kerosene (or diesel) fractions to obtain high-purity normal paraffins, which are liquid waxes. Molecular sieve refers to artificially synthesized zeolite, which is an adsorbent with a uniform microporous structure. The molecular sieve used in the production of liquid wax is mainly 5A molecular sieve, with a pore size of 0.52nm, which can adsorb normal structure with a critical diameter of 0.49nm. alkane molecule. T...

Claims

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Application Information

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IPC IPC(8): C10G29/22
Inventor 王立言
Owner CHINA PETROLEUM & CHEM CORP
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