阅读说明：本技术 一种回收油水混合物中油的方法 (Method for recovering oil from oil-water mixture ) 是由 郭强 贾志军 王亚宁 宋陶练 吴增辉 于 2021-11-04 设计创作，主要内容包括：本发明属于回收技术领域,具体涉及一种回收油水混合物中油的方法。本发明提供了一种回收油水混合物中油的方法,包括以下步骤：将油水混合物进行分液,除去下层水,得到油液；利用无水氯化钙吸附所述油液中的水,得到初级回收油；利用无水硅胶吸收所述初级回收油中的水,直到无水硅胶不变色,得到回收油。本发明利用分液的方式除去油水混合物中的大部分水,然后利用无水氯化钙进行粗除水,最后利用无水硅胶进行精除水同时起到验证回收油中是否存在水分子的作用。(The invention belongs to the technical field of recovery, and particularly relates to a method for recovering oil from an oil-water mixture. The invention provides a method for recovering oil in an oil-water mixture, which comprises the following steps: separating the oil-water mixture, and removing the lower layer water to obtain oil liquid; absorbing water in the oil liquid by using anhydrous calcium chloride to obtain primary recovered oil; and absorbing water in the primary recovered oil by using anhydrous silica gel until the anhydrous silica gel is not discolored to obtain the recovered oil. The method utilizes a liquid separation mode to remove most of water in the oil-water mixture, then utilizes anhydrous calcium chloride to carry out coarse water removal, and finally utilizes anhydrous silica gel to carry out fine water removal and simultaneously plays a role in verifying whether water molecules exist in the recovered oil.)

1. A method for recovering oil in an oil-water mixture comprises the following steps:

separating the oil-water mixture, and removing the lower layer water to obtain oil liquid;

absorbing water in the oil liquid by using anhydrous calcium chloride to obtain primary recovered oil;

and absorbing water in the primary recovered oil by using anhydrous silica gel until the anhydrous silica gel is not discolored to obtain the recovered oil.

2. The recovery method of claim 1, wherein the oil-water mixture comprises a jet fuel and water mixture, a gasoline and water mixture, or a diesel and water mixture.

3. The recovery method according to claim 1, wherein the volume ratio of the anhydrous calcium chloride to the oil-water mixture is not less than 1: 1.

4. The recovery method according to claim 1 or 3, wherein the step of adsorbing water in the oil by using anhydrous calcium chloride comprises the following steps:

laying anhydrous calcium chloride on the surface of filter cloth in a suction filtration device;

and carrying out suction filtration on the oil liquid to obtain primary recovered kerosene.

5. The recovery method according to claim 4, wherein the thickness of the anhydrous calcium chloride spread on the surface of the filter cloth in the suction filtration device is 2 to 5 cm.

6. The recovery method according to claim 4, wherein the number of times of suction filtration is 3 to 5 times.

7. The recovery method according to claim 1, wherein the volume ratio of the anhydrous silica gel to the oil-water mixture is not less than 1: 1.

8. The recovery method according to claim 1 or 7, wherein the absorption of water in the primary recovered kerosene by means of anhydrous silica gel comprises the steps of:

paving anhydrous silica gel on the surface of filter cloth in a suction filtration device;

carrying out suction filtration on the primary recovered oil to obtain recovered oil; and in the suction filtration process, after the color of the silica gel is changed, the anhydrous silica gel is replaced until the color of the anhydrous silica gel is not changed.

9. The recycling method according to claim 8, wherein the thickness of the anhydrous silica gel paved on the surface of the filter cloth in the suction filtration device is 2-5 cm.

10. The recovery method according to claim 8, wherein the number of times of suction filtration is 3 to 5 times.

Technical Field

The invention belongs to the technical field of recovery, and particularly relates to a method for recovering oil from an oil-water mixture.

Background

Aviation kerosene is one of petroleum products, known as odorless kerosene, and mainly consists of hydrocarbon compounds in different fractions. The aviation kerosene has the advantages of proper density, high heat value, good combustion performance, rapid, stable, continuous and complete combustion, small combustion area, less carbon deposition and difficult coking; the low-temperature fluidity is good, and the requirements of cold regions and high-altitude flight on the fluidity of oil products can be met; the thermal stability and the anti-oxidation stability are good, and the requirement of supersonic high-altitude flight can be met; high cleanliness, no harmful substances such as mechanical impurities and water, low sulfur content, especially low mercaptan sulfur content, and less corrosion to machine parts.

Aviation kerosene has been widely used in gas turbine engines and ramjet engines due to the above advantages, but under the action of ultrasonic waves, shearing forces or other external forces, water or oil becomes fine droplets and is dispersed in another phase to become an emulsion-like oil-water mixture, and the oil and water in such oil-water mixture are difficult to separate. At present, the oil-water mixture is mostly separated by adopting membrane separation technologies such as microfiltration, ultrafiltration or nanofiltration and the like. However, these separation techniques are costly and the separation effect is susceptible to factors such as flow rate, temperature, pH, and membrane material.

Disclosure of Invention

In view of the above, the invention provides a method for recovering oil in an oil-water mixture, and the recovery method provided by the invention is simple and easy to implement, has small interference, can visually determine that the recovered oil does not contain water, and greatly improves the recovery efficiency.

In order to solve the technical problem, the invention provides a method for recovering oil in an oil-water mixture, which comprises the following steps:

separating the oil-water mixture, and removing the lower layer water to obtain oil liquid;

absorbing water in the oil liquid by using anhydrous calcium chloride to obtain primary recovered oil;

and absorbing water in the primary recovered oil by using anhydrous silica gel until the anhydrous silica gel is not discolored to obtain the recovered oil.

Preferably, the oil-water mixture comprises a mixture of aviation kerosene and water, a mixture of gasoline and water or a mixture of diesel oil and water.

Preferably, the volume ratio of the anhydrous calcium chloride to the oil-water mixture is not less than 1: 1.

Preferably, the method for adsorbing water in the oil by using anhydrous calcium chloride comprises the following steps:

laying anhydrous calcium chloride on the surface of filter cloth in a suction filtration device;

and carrying out suction filtration on the oil liquid to obtain primary recovered kerosene.

Preferably, the thickness of the anhydrous calcium chloride paved on the surface of the filter cloth in the suction filtration device is 2-5 cm.

Preferably, the number of times of suction filtration is 3-5.

Preferably, the volume ratio of the anhydrous silica gel to the oil-water mixture is not less than 1: 1.

Preferably, the absorption of water in the primary recovered kerosene by means of anhydrous silica gel comprises the following steps:

paving anhydrous silica gel on the surface of filter cloth in a suction filtration device;

carrying out suction filtration on the primary recovered oil to obtain recovered oil; and in the suction filtration process, after the color of the silica gel is changed, the anhydrous silica gel is replaced until the color of the anhydrous silica gel is not changed.

Preferably, the thickness of the anhydrous silica gel paved on the surface of the filter cloth in the suction filtration device is 2-5 cm.

Preferably, the number of times of suction filtration is 3-5.

The invention provides a method for recovering oil in an oil-water mixture, which comprises the following steps: separating the oil-water mixture, and removing the lower layer water to obtain oil liquid; absorbing water in the oil liquid by using anhydrous calcium chloride to obtain primary recovered oil; and absorbing water in the primary recovered oil by using anhydrous silica gel until the anhydrous silica gel is not discolored to obtain the recovered oil. The method utilizes a liquid separation mode to remove most of water in the oil-water mixture, then utilizes anhydrous calcium chloride to carry out coarse water removal, and finally utilizes anhydrous silica gel to carry out fine water removal and simultaneously plays a role in verifying whether water molecules exist in the recovered oil.

Detailed Description

The invention provides a method for recovering oil in an oil-water mixture, which comprises the following steps:

separating the oil-water mixture, and removing the lower layer water to obtain oil liquid;

absorbing water in the oil liquid by using anhydrous calcium chloride to obtain primary recovered oil;

and absorbing water in the primary recovered oil by using anhydrous silica gel until the anhydrous silica gel is not discolored to obtain the recovered oil.

According to the invention, the oil-water mixture is subjected to liquid separation, and the lower layer water is removed to obtain the oil. In the present invention, the oil-water mixture preferably includes a mixture of aviation kerosene and water, a mixture of gasoline and water, or a mixture of diesel oil and water, and more preferably a mixture of aviation kerosene and water. In the invention, the volume ratio of oil to water in the oil-water mixture is preferably 1.8-2.2, and more preferably 1: 2. In the present invention, the separation is preferably performed in a separatory funnel; the liquid separation preferably comprises the following steps:

and placing the oil-water mixture in a separating funnel, standing for layering, and opening a valve of the separating funnel to remove water on the lower layer to obtain oil.

In the invention, the standing time is preferably 0.45-0.55 h, and more preferably 0.5-0.53 h.

After the oil liquid is obtained, the invention uses anhydrous calcium chloride to adsorb water in the oil liquid, and primary recovered oil is obtained. In the invention, the volume ratio of the anhydrous calcium chloride to the oil-water mixture is preferably not less than 1:1, more preferably 2-3: 1, and still more preferably 2: 1. In the invention, the adsorption of water in the oil by using anhydrous calcium chloride preferably comprises the following steps:

laying anhydrous calcium chloride on the surface of filter cloth in a suction filtration device;

and carrying out suction filtration on the oil liquid to obtain primary recovered kerosene.

The suction filtration device is not particularly limited, so long as suction filtration can be achieved. In an embodiment of the present invention, the suction filtration device is a buchner funnel. In the invention, the thickness of the anhydrous calcium chloride paved on the surface of the filter cloth in the suction filtration device is preferably 2-5 cm, and more preferably 3-4 cm. In the present invention, the number of times of the suction filtration is preferably 3 to 5 times, and more preferably 4 times.

After the primary recovered oil is obtained, the water in the primary recovered oil is absorbed by using anhydrous silica gel until the anhydrous silica gel is not discolored, so that the recovered oil is obtained. In the invention, the volume ratio of the anhydrous silica gel to the oil-water mixture is preferably not less than 1:1, more preferably 2-3: 1, and still more preferably 2: 1. In the present invention, the absorption of water in the primary recovered kerosene by means of anhydrous silica gel preferably comprises the steps of:

paving anhydrous silica gel on the surface of filter cloth in a suction filtration device;

carrying out suction filtration on the primary recovered oil to obtain recovered oil; in the suction filtration process, the anhydrous silica gel needs to be replaced after the color of the silica gel is changed until the anhydrous silica gel does not change the color.

The suction filtration device is not particularly limited, so long as suction filtration can be achieved. In an embodiment of the present invention, the suction filtration device is a buchner funnel. In the invention, the thickness of the anhydrous silica gel paved on the surface of the filter cloth in the suction filtration device is preferably 2-5 cm, and more preferably 3-4 cm. In the present invention, the number of times of the suction filtration is preferably 3 to 5 times, and more preferably 4 times.

In the present invention, the water content in the recovered oil is preferably less than 0.1%, more preferably 0.02 to 0.08%.

In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.

Example 1

500mL of hydrous kerosene (the volume ratio of aviation kerosene to water is 1:2) from Hebei Yuanzhen environmental protection science and technology development Limited company is placed in a separating funnel and stands for 0.5h, and a valve of the separating funnel is opened to remove water at the lower layer to obtain oil;

laying anhydrous calcium chloride with the thickness of 5cm on the surface of filter cloth in a Buchner funnel with the diameter of 6cm, and carrying out suction filtration on oil for 4 times to obtain primary recovered kerosene;

laying anhydrous silica gel with the thickness of 5cm on the surface of filter cloth in a Buchner funnel with the diameter of 6cm, carrying out suction filtration on primary recovered kerosene, changing the sewage silica gel into blue after 1-time suction filtration, replacing the silica gel which is changed into blue with new anhydrous silica gel, continuing the suction filtration, and obtaining the recovered kerosene after the silica gel which is not changed into blue after the 3 rd-time suction filtration.

Detecting the water content in the recovered kerosene by using a gas chromatograph-mass spectrometer (GCMS) with the model of Agilent 7890A GC-5975C MS, and marking as eta 1; the kerosene recovery was calculated according to formula 1:

where η 2 is the kerosene recovery and V is the volume of kerosene recovered (mL).

The experiment was repeated 5 times according to the method of example 1, and the recovery results are shown in Table 1.

TABLE 1 Water content of kerosene recovery and kerosene recovery

Number of experiments	V(mL)	η1(％)	η2(％)
				1	333	0.02	99.99
2	333	0.05	99.90
				3	333	0.04	99.95
4	333	0.06	99.98
				5	330	0.08	98.95

As can be seen from the data in Table 1, the water content of the kerosene recovered by the recovery method provided by the invention is less than 0.1%, the recovery rate of the kerosene is more than 99.9%, and the quality of the recovered kerosene meets the requirements of the standard GB 253-2008.

The recovery method provided by the invention is simple and easy to operate, has high repetition rate, and the recovered kerosene has low water content and high kerosene recovery rate.

Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.