JP2696652B2 - Rust prevention method for glass-lined reaction tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing rust in a glass-lined reaction tank, and more particularly, to a reaction tank such as a stirring tank having a glass lining on the inner surface. The present invention relates to a rustproofing method for rustproofing an inner surface of a jacket.

[0002]

2. Description of the Related Art Generally, a glass-lined reaction tank is
It is necessary to treat the outer surface of the reaction tank and the inner surface of the jacket to prevent rust on the jacket provided outside, but in this type of conventional reaction tank, the rust prevention treatment is performed only by painting. Had been

[0003]

However, according to the rust prevention treatment using only such a coating, the generation and adhesion of rust due to a heat medium such as steam or a refrigerant such as water cannot be prevented, and the corrosion of the rust cannot be prevented. Thus, there is a problem that the heat transfer effect is quickly reduced.

The present invention has been made to solve such problems, and has as its object to prevent corrosion by a heat medium or a refrigerant for a long period of time and maintain a heat transfer effect.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a means for solving the problem is a reaction tank (1) having a glass lining on the inner surface side. an inner surface side of the outer surface and the jacket (6) of), concentrated
When the acid is less than 10wt% and the temperature is 60 ℃ or less for 30 minutes or less
After that, the outer surface of the reaction tank (1) and the jacket
An object of the present invention is to provide an inner surface side of the reaction tank (1) and an inner surface side of the jacket (6) by performing electroless plating on the inner surface side of (6).

[0006]

[Action] In the present invention, the glass lining is
The outer surface of the reactor 1 and the inner surface of the jacket 6
To perform electrolytic plating, the outer surface of the
That the generation and adhesion of rust to the inner surface of the
Become.

When applying electroless plating, it is washed with acid.
Although it is preferable to clean, acid cleaning
This phenomenon is called a shock, that is, the action of an acid on a metal.
Hydrogen gas is generated, and this hydrogen gas is
Vacancies (glass bubbles, steel surface defects)
Etc.), causing high pressure and damage to the glass lining layer.
There is a possibility that the phenomenon of scratching may occur.

[0008] However, as described above, the acid concentration is 10 wt% or less.
When washing under conditions of 60 ° C or less and 30 minutes or less,
The generation of such hydrogen gas is prevented, and thus the glass
This also prevents damage to the lining layer.

[0009]

Embodiments of the present invention will be described below.

First, as shown in FIG. 1, a glass lining reaction tank 1 is prepared.

That is, as shown in FIG. 2, the reaction tank 1 has a glass lining layer 3 formed by applying a glass lining to an inner surface of an iron base (carbon steel) 2. A sealer 4 and a collar 5 for forming a jacket 6 described below are attached to the outside.

Next, the outer surface of the reaction tank 1 (iron base 2
Side) is subjected to a base treatment called sandblasting, and the treated surface is washed with water.

Next, as shown in FIG. 3, an iron jacket 6 is attached to the outer surface side of the reaction tank 1 for heating and cooling the contents of the reaction tank by passing a heat medium or a refrigerant therein.

The jacket 6 is provided with an acid inlet 7 and a gas outlet 8 for discharging hydrogen gas generated in the jacket 6 as shown in FIG. ing.

After the jacket 6 is installed in this manner, hydrochloric acid flows into the inlet 7 to wash the outer surface of the reaction tank 1 (the surface of the iron base 2) and the inner surface of the jacket 6.

This hydrochloric acid is adjusted to a concentration of 3% by weight.

The temperature in the jacket 6 during cleaning is 40
° C and the washing time is 3 minutes.

When the outer surface of the reaction tank 1 is washed with hydrochloric acid as described above, hydrogen gas is generated, and thus the hydrogen gas is filled in the jacket 6, so that the hydrogen gas is discharged from the gas discharge port 8.

In this case, the generated hydrogen gas is
An attempt is made to penetrate from the outer surface of the iron base material 2 to the inner surface of the glass lining layer 3. There is no occurrence of breakage of the glass lining layer 3 due to hydrogen gas called shock.

Next, after the pickling as described above, washing with water is performed again, and thereafter, the outer surface of the reaction tank 1 and the jacket 6 are removed.
Electroless nickel plating is applied to the inner surface side of.

As a result, a nickel plating layer 9 is formed on the outer surface of the glass lining layer 3 and on the inner surface of the jacket 6 as shown in FIG.

After the electroless nickel plating is performed as described above, washing with water is performed again, and further, after neutralization by an alkali treatment and drying, the rust prevention treatment is completed.

By performing the electroless nickel plating in this manner, rust is prevented from being generated on the outer surface side of the reaction vessel 1 and the inner surface side of the jacket 6, and the heat transfer effect of the reaction vessel 1 is maintained for a long time. It will be.

In the above embodiment, nickel is plated by electroless plating. However, the type of metal plated by electroless plating is not limited to nickel of this embodiment. It is also possible to use any kind of metal. The point is that the outer surface side of the reaction tank 1 and the inner surface side of the jacket need only be subjected to rust prevention treatment by electroless plating.

In this embodiment, the concentration of hydrochloric acid is 3 wt%.
Had been prepared, the concentration of hydrochloric acid is not limited thereto, it may be any short or less 10 wt%.

Further, the kind of the acid for washing is not limited to the hydrochloric acid of this embodiment, but other acids such as sulfuric acid and nitric acid, and mixed acids can be used.

Furthermore, the temperature of the jacket 6 at the time of washing is not limited to 40 ° C. of the above embodiment, principal may be at 60 ° C. or less.

Furthermore, the cleaning time is also not limited to three minutes of the above embodiment, it is within short 30 minutes.

Further, the type of the reaction tank 1 may be any type such as a stirring reaction tank.

Further, the material constituting the reaction tank 1 is not limited to the carbon steel of the above embodiment.

In addition, the process procedure for the rust prevention treatment is not limited to the above-described embodiment. In short, in the present invention, an electroless nickel plating process may be included.

[0032]

As described above, the present invention provides electroless plating on the outer surface of a glass-lined reactor and the inner surface of a jacket, so that the outer surface of the reactor and the inner surface of the jacket are provided. The generation and adhesion of rust to the surface are prevented.

Accordingly, corrosion by the heat medium or the refrigerant can be prevented for a long time, and the heat transfer effect can be maintained for a long time.

Before applying the electroless plating ,
The outer surface of the reaction vessel with glass lining and the jacket
Since the inner surface of the substrate is washed with an acid having a concentration of 10% or less at a temperature of 60 ° C. or less for 30 minutes or less, a phenomenon referred to as so-called acid shock does not occur.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a reaction tank.

FIG. 2 is an enlarged sectional view of a main part of a reaction tank.

FIG. 3 is a schematic sectional view showing a state where a jacket is installed.

FIG. 4 is an enlarged sectional view of a main part of a reaction tank in a state of electroless plating.

[Explanation of symbols]

 1 ... reaction tank 3 ... glass lining layer 9 ... electroless nickel plating layer

Continuation of the front page (56) References JP-A-61-281856 (JP, A) JP-A-61-291979 (JP, A) Jikken Sho 51-36991 (JP, Y1) , Y1) Tokuzo Kobe, "Electroless Plating", 1st Edition (September 30, 1990) Bookstore P. 15-16

Claims (1)

(57) [Claims] The concentration of a concentration between an outer surface of a reaction tank (1) having a glass lining on an inner surface and an inner surface of a jacket (6) is determined.
Time of 30 minutes or less under the condition of 60 ° C or less with acid of 10wt% or less
After washing, the outer surface of the reactor (1) and the jacket
The inner surface of (6) is subjected to electroless plating, whereby the outer surface of the reactor (1) and the inner surface of the jacket (6) are treated to prevent rust. Rust treatment method.