CN1332011C - Refining method for tung oil - Google Patents

Abstract

The present invention provides a refining method of tung oil, which comprises the following specific steps: a, pressed and filtered tung oil is heated to 70 to 90DEG C; b, the heated tung oil is conveyed to a vacuum extracting device which pumps water and impurities out in vacuum; c, then, the tung oil is conveyed to a depositing tower for further deposition so as to obtain refined tung oil, wherein the time for deposition as least lasts for 15 days. The highest temperature in the processing process reaches 90DEG C, which ensures the color of tung oil refined by the method. The obtained tung oil has high quality and light color. The content of impurities in the tung oil is less than 0.15%, and the water content is less than 0.1%, which completely reaches the standards of first grade oil and second grade oil prescribed by the national tung oil standard (GB82777-87).

Description

The method of refining of tung oil

Technical field

The present invention relates to the working method of tung oil, especially the method for refining of tung oil.

Background technology

Tung oil is a kind of important industrial raw material as a kind of important afforestation product, is widely used in industries such as system lacquer, printing, electronics, national defence machinery.The existing method that obtains tung oil with the paulownia seed is to continue to use the extracting method of edible vegetable oil basically, that is: the shelling of paulownia seed, pulverize, steam fry, squeezing obtains a mao tung oil, filtration obtains product then.In this conventional working method, the tung oil quality that obtains is low, colourity is dark, in the tung oil impurity content about 1.5-2.5%, water content is about 1～2%.This tung oil does not reach national tung oil GB8277-87 standard far away.Because the limitation of ordinary method, the quality of tung oil can not get guaranteeing that its utilization also has been subjected to certain limitation always, restricted the development of domestic a lot of tung oil manufacturing enterprise.The quality that how to improve tung oil is a bottleneck problem of existing domestic tung oil manufacturing enterprise.

Summary of the invention

In order to improve the quality of squeezing the tung oil that obtains, improve the present situation that domestic tung oil is produced, the present invention proposes the method for refining of tung oil.

For this reason, the present invention is achieved through the following technical solutions:

The method of refining of tung oil, its concrete steps are as follows:

A, the tung oil that squeezing, filtration are obtained are heated to 70～90 ℃;

B, the tung oil after the heating is transported to carries out vacuum in the vacuum withdraw device and draw water, take out impurity;

C, then is transported in the settling tower further precipitation to tung oil, obtains the tung oil after the refining; Wherein, sedimentation time was at least 15 days; The precipitation temperature that described tung oil is transported in the settling tower is 50～60 ℃.

The tung oil that adopts the aforesaid method refining to obtain, top temperature in the processing is at 90 ℃, can guarantee the colourity of tung oil, the tung oil quality height that obtains, colourity is shallow, in the tung oil impurity content below 0.15%, water content is below 0.1%, reached the I and II oil standard of stipulating in the national tung oil GB8277-87 standard fully.The precision work of tung oil has been opened up in this invention, for the degree of depth production of tung oil provides assurance, the quality of tung oil is more optimized, the perfect machining chain of tung oil.

Embodiment

Below, by specific embodiment the present invention is further described:

A kind of method of refining of tung oil, its concrete steps are described below:

A, the tung oil that squeezing, filtration are obtained are heated to 78～82 ℃; Type of heating is: use double pipeline, a discharge pipe leads to tung oil, a discharge pipe water flowing steam, and the mode by heat exchange heats tung oil;

B, the tung oil after the heating is transported to carries out vacuum in the vacuum withdraw device and draw water, take out impurity; Described vacuum withdraw device is a jar that is connected with vacuum pump;

C, then is transported in the high-rise settling tower further precipitation to tung oil, and sedimentation time is 20 days, obtains the tung oil after the refining.

Wherein, the temperature that tung oil advances settling tower is preferably in 50～60 ℃, can reduce the viscosity of tung oil like this, helps the abundant precipitation of impurity.

The tung oil that obtains by aforesaid method is by inspection by sampling, and its every index is: transparency is good, and moisture is below 0.1%, and foreign matter content is below 0.1%, and acid value is in 3.0.This method purified tung oil has reached primary standard.

In aforesaid method, the type of heating of tung oil also can adopt modes such as electrically heated, coal heating.

The longer the better in the sedimentation time described in the step c, and in scale operation, sedimentation time was at 20～30 days, and the tung oil quality that obtains like this is more stable, and it is little to fluctuate.

Claims (1)

1, the method for refining of tung oil, its concrete steps are as follows:

A, the tung oil that squeezing, filtration are obtained are heated to 70～90 ℃;

B, the tung oil after the heating is transported to carries out vacuum in the vacuum withdraw device and draw water, take out impurity;

C, then is transported in the settling tower further precipitation to tung oil, obtains the tung oil after the refining; Wherein, sedimentation time was at least 15 days; The precipitation temperature that described tung oil is transported in the settling tower is 50～60 ℃.