CN103954519A - Experiment method used for measuring solvent displacement amount needed for cleaning polyvinyl acetate in equipment and pipelines - Google Patents
Experiment method used for measuring solvent displacement amount needed for cleaning polyvinyl acetate in equipment and pipelines Download PDFInfo
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- CN103954519A CN103954519A CN201410146250.6A CN201410146250A CN103954519A CN 103954519 A CN103954519 A CN 103954519A CN 201410146250 A CN201410146250 A CN 201410146250A CN 103954519 A CN103954519 A CN 103954519A
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- polyvinyl acetate
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Abstract
The invention relates to an experiment method used for measuring solvent displacement amount needed for cleaning polyvinyl acetate in equipment and pipelines. The experiment method is mainly used for solving a problem that it is impossible to determine whether polyvinyl acetate in equipment and pipelines is removed completely by existing technology. The experiment method used for measuring solvent displacement amount needed for cleaning polyvinyl acetate in equipment and pipelines comprises following steps: (1) polyvinyl acetate is delivered into an experimental steel tube E, and the amount of filled polyvinyl acetate (m1) is calculated; (2) a solvent is delivered into the experimental steel tube E; (3) polyvinyl acetate in the experimental steel tube E is displaced continuously, when the total weight of the experimental steel tube E and materials in the experimental steel tube E is stable, a mixed solution collected by a waste liquid tank H is weighted so as to obtain the amount of the mixed solution (m2), and the solvent displacement amount m0=m2-m1. The experiment method is capable of solving the above problem preferably, and can be used for experiments used for measuring solvent displacement amount needed for cleaning polyvinyl acetate in equipment and pipelines.
Description
Technical field
The present invention relates to a kind of experimental technique of measuring the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline.
Background technology
Can there is homopolymerization in vinyl acetate (Vinyl acetate, VAc), also can with a lot of other monomer generation copolyreaction, be one of 50 kinds of industrial chemicals of output maximum in the world.The synthetic macromolecular compound that vinyl acetate polymerization or copolymerization obtain, vinyl acetate, by producing a series of derivants such as polyvinyl acetate, polyvinyl alcohol (PVA), acetal resin, obtains applying more and more widely in fields such as coating, synthon, leather processing, soil improvements.
The intermediate product polyvinyl acetate of vinyl acetate polymerization is a kind of high viscosity liquid, often can stick together at equipment and inner-walls of duct in process of production, causes equipment to stop up.Therefore, in the time that workshop appliance overhauls, must use appropriate solvent (methyl alcohol) flushing pipe inwall, cleaning is attached to the polyvinyl acetate of equipment inner wall.
CN200710006958.1 provides a kind of laser gas replacement amount determinator, control device is in the time vacuumizing gas compartment or carry out purge, the time interval that interval predetermines, by air pressure analyzer, the pressure in gas compartment being carried out to the first mensuration and second measures, according to the result of the first mensuration and the second result of measuring, the laser gas replacement amount of the unit interval while obtaining laser generation action.But the mensuration of gas and liquid exists different greatly, because methyl alcohol has certain toxicity, and in flushing process, whether the equipment of cannot opening is observed polyvinyl acetate and is cleaned up, and therefore needs to design an experimental provision the required quantity of methyl alcohol of cleaning equipment is simulated to measuring and calculating.
Summary of the invention
Technical matters to be solved by this invention is cannot confirm the problem whether polyvinyl acetate has cleaned up in prior art, and the experimental technique of the required solvent exchange amount of polyvinyl acetate in a kind of new measurement cleaning equipment and pipeline is provided.The method, for measuring the experiment of the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, has advantages of and can calculate and confirm whether polyvinyl acetate cleans up.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of experimental technique of measuring the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, comprises the steps:
(1) polyvinyl acetate of required cleaning is filled in test steel pipe E, and by with the amount (m1) that calculates the polyvinyl acetate filling of poor quality of test steel pipe E;
(2) open solvent feed pump B, solvent is poured in test steel pipe E through pipeline C, polyvinyl acetate and solvent liquid enter in waste liquid tank H through pipeline G;
(3) constantly adding along with solvent, polyvinyl acetate in test steel pipe E is constantly out replaced, test steel pipe E is full of by solvent, in the time that the material general assembly (TW) in test steel pipe E and test steel pipe E remains unchanged, be the terminal of the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, polyvinyl acetate in collection waste liquid tank H and the mixed liquor of solvent, claim to obtain and rinse the weight (m2) of mixed liquor afterwards, rinses quantity of solvent m0=m2-m1 used.
In technique scheme, preferably, described solvent is methyl alcohol.
In technique scheme, preferably, the quality of described test steel pipe E and inside stuffing matter adopts online detection in real time.
In technique scheme, preferably, the amount of the polyvinyl acetate filling (m1) is for filling the required amount of full test steel pipe E.
In the present invention, in described solvent exchange amount and equipment and pipeline the experiment of the relation of polyvinyl acetate amount will be on the polyvinyl acetate of different densities, different polymerization degree and the test steel pipe of unlike material, different size on carry out improving targetedly guide data after many experiments.
The present invention utilizes the experimental provision of different inner diameters and length according to a certain percentage device context situation to be carried out to experimental simulation, thereby be used for calculating the needed quantity of solvent of polyvinyl acetate in complete cleaning equipment, effectively required minimum quantity of solvent is rinsed in analog field device can scene measuring and calculating, for field apparatus maintenance clean-out operation regulates solvent use amount that foundation is provided, save thereby reach the quantity of solvent using in cleaning process, the object saving production cost, has obtained good technique effect.
Brief description of the drawings
Fig. 1 is the structural representation of device of the present invention.
A is solvent tank; B is solvent feed pump; C is feeding line; D is the joint flange of test steel pipe E and feeding line C; E is test steel pipe; F is the joint flange of test steel pipe E and discharging pipeline G; G discharging pipeline; H is waste liquid tank.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Embodiment
[embodiment 1]
On device as shown in Figure 1, solvent adopts methyl alcohol, and test steel pipe E is 304 stainless steels, long 1.5m, and diameter 0.05m, is then 241.78kg/m by the density of required cleaning
3, low viscous polyvinyl acetate fills in steel pipe, fills up steel pipe, and by with the amount m1 of the polyvinyl acetate that calculates interpolation of poor quality of steel pipe, be 2.847kg.Then opening plunger feeder pump B, methyl alcohol in solvent tank A is poured in test steel pipe E, polyvinyl acetate and methyl alcohol mixed liquor enter in waste liquid tank H after pipeline G, along with constantly adding of methyl alcohol, in test steel pipe E, polyvinyl acetate is all out replaced, and test steel pipe E is full of (can calculate by quality) by methyl alcohol, the polyvinyl acetate in collection waste liquid tank H and the mixed liquor of methyl alcohol, claiming to such an extent that rinse the weight m2 of potpourri afterwards, is 10.9589kg.
Rinse quantity of methyl alcohol m0=m2-m1=8.1119kg used.
In can drawing thus quantity of methyl alcohol used and installing, the mass ratio of polyvinyl acetate, calculates in commercial plant thereby amplify.
Claims (4)
1. an experimental technique of measuring the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, comprises the steps:
(1) polyvinyl acetate of required cleaning is filled in test steel pipe E, and by with the amount (m1) that calculates the polyvinyl acetate filling of poor quality of test steel pipe E;
(2) open solvent feed pump B, solvent is poured in test steel pipe E through pipeline C, polyvinyl acetate and solvent liquid enter in waste liquid tank H through pipeline G;
(3) constantly adding along with solvent, polyvinyl acetate in test steel pipe E is constantly out replaced, test steel pipe E is full of by solvent, in the time that the material general assembly (TW) in test steel pipe E and test steel pipe E remains unchanged, be the terminal of the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, polyvinyl acetate in collection waste liquid tank H and the mixed liquor of solvent, claim to obtain and rinse the weight (m2) of mixed liquor afterwards, rinses quantity of solvent m0=m2-m1 used.
2. the experimental technique of measuring according to claim 1 the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, is characterized in that described solvent is methyl alcohol.
3. measure according to claim 1 the experimental technique of the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, it is characterized in that the quality of described test steel pipe E and inside stuffing matter adopts online detection in real time.
4. measure according to claim 1 the experimental technique of the required solvent exchange amount of polyvinyl acetate in cleaning equipment and pipeline, it is characterized in that the amount (m1) of the polyvinyl acetate filling is for filling the required amount of full test steel pipe E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410146250.6A CN103954519B (en) | 2014-04-11 | 2014-04-11 | Measure the experimental technique of solvent replacement amount needed for polyvinyl acetate in cleaning equipment and pipeline |
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| CN201410146250.6A CN103954519B (en) | 2014-04-11 | 2014-04-11 | Measure the experimental technique of solvent replacement amount needed for polyvinyl acetate in cleaning equipment and pipeline |
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| CN103954519A true CN103954519A (en) | 2014-07-30 |
| CN103954519B CN103954519B (en) | 2016-02-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773247A (en) * | 2005-10-18 | 2006-05-17 | 河海大学 | Method for measuring material critical non-corrosion air concentration value |
| CN101013790A (en) * | 2006-02-02 | 2007-08-08 | 发那科株式会社 | Gas laser oscillator and method of measuring laser gas replacement amount |
| CN101246105A (en) * | 2008-01-16 | 2008-08-20 | 东北电力大学 | Method and device for measuring anti-dirty performance of material surface based on weight method |
| CN102645388A (en) * | 2012-03-27 | 2012-08-22 | 宜宾北方川安化工有限公司 | Method for measuring content of mixed ester in nitro paint cloth |
| CN103592201A (en) * | 2013-10-18 | 2014-02-19 | 中国农业大学 | Volume substitution method for measuring soil grain density and equipment |
-
2014
- 2014-04-11 CN CN201410146250.6A patent/CN103954519B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1773247A (en) * | 2005-10-18 | 2006-05-17 | 河海大学 | Method for measuring material critical non-corrosion air concentration value |
| CN101013790A (en) * | 2006-02-02 | 2007-08-08 | 发那科株式会社 | Gas laser oscillator and method of measuring laser gas replacement amount |
| CN101246105A (en) * | 2008-01-16 | 2008-08-20 | 东北电力大学 | Method and device for measuring anti-dirty performance of material surface based on weight method |
| CN102645388A (en) * | 2012-03-27 | 2012-08-22 | 宜宾北方川安化工有限公司 | Method for measuring content of mixed ester in nitro paint cloth |
| CN103592201A (en) * | 2013-10-18 | 2014-02-19 | 中国农业大学 | Volume substitution method for measuring soil grain density and equipment |
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| CN103954519B (en) | 2016-02-17 |
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