JPS5910399B2 - Catalytic blown asphalt manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an efficient method for producing blown asphalt using a catalyst (hereinafter referred to as catalyst blown asphalt).

Blown asphalt (hereinafter commonly referred to as blown asphalt), which is obtained by air blowing soft petroleum asphalt heated to a high temperature without a catalyst, is an improved version of petroleum asphalt with improved temperature sensitivity, but it is used for waterproofing construction of buildings, etc. If this is the case, even higher quality is required.

For this reason, POIJ IJ has traditionally been used for purposes such as waterproofing work.
High quality catalytic blown asphalt is produced using phosphoric acid or phosphorus pentoxide as a catalyst.

Catalytic blown asphalt uses soft petroleum asphalt as the raw material, as in the case of ordinary blown asphalt, and adds a number of polyphosphoric acids or phosphorus pentoxide to it.
It is produced continuously or batchwise by air blowing while heating to 50 to 270°C.

In this case, phosphoric acid or phosphorus pentoxide has a remarkable effect on improving the heat resistance and low temperature resistance of the product, but it does not have the effect of accelerating the blowing reaction like a catalyst in a general chemical reaction, and the product is The disadvantage is that the reaction time required to achieve this is longer than in the case of ordinary blown asphalt without addition of polyacid or phosphorus pentoxide.

For example, in experiments conducted by the present inventors, when the same raw materials were treated under the same conditions, the reaction time required to obtain a product with the same needle strength was 1.0 in the case of no catalyst. When adding lwt% and 2wt% of
．． 23 times and 1.33 times, and phosphorus pentoxide
1.66 for wt% and 2wt% additions, respectively.
The reaction time was long for both times and 2.00 times the catalyst blown asphalt.

As a result of research into shortening the S reaction time while maintaining the high quality of catalytic blown asphalt, the present inventors discovered that the reaction time could be shortened by mixing ordinary blown asphalt into a portion of the raw materials. The present invention was completed.

That is, the gist of the present invention is to produce catalytic blown asphalt, which is characterized by shortening the reaction time and increasing the production amount by mixing ordinary blown asphalt with the catalytic blown asphalt raw material. It's a method.

As the ordinary blown asphalt to be mixed with the catalytic blown asphalt raw material, all needle-sized asphalts specified in rJIsK2207 ``Blown Asphalt'' can be used.

In addition, the amount of ordinary blown asphalt to be mixed can be determined appropriately depending on the quality required of the catalyst blown asphalt, but if the amount mixed is too small, the reaction time cannot be expected to be shortened, and if the amount mixed is too large, the catalyst In some cases, the original high quality of blown asphalt cannot be maintained.
Generally, it is selected from the range of 10 to 50 wt%, but “JI
In order to pass the regulations of sA6011 4 Types of Asphalt for Waterproofing Works, it is desirable to select from the range of 10 to 40 wt%.

The reaction conditions (temperature, amount of blown air, amount of catalyst) when producing catalytic blown asphalt by mixing normal blown asphalt may be the same as when normal blown asphalt is not mixed.

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

Example 1 1.0 wt % of polyphosphoric acid was added to soft petroleum asphalt, which is a raw material for ordinary soft asphalt, and it was
This ordinary blown asphalt (needle hardness 15, softening point 97
°C) at 10wt%, 20wt%, 30wt% and 4
Catalytic blown asphalt raw material mixed with 0wt% 500
G is heated to 260°C and air is blown through a 63 glass filter at a rate of 30 1/hr to obtain needle size 30/l.
40 catalyst blown asphalts were produced.

The required reaction time and product properties in this case are shown in Table 1. As the amount of ordinary blown asphalt mixed increased, the required reaction time was significantly shortened, but when ordinary blown asphalt was mixed up to 4wt% The product also maintained the high quality specified in ``JISA6011 Type 4 Asphalt for Waterproofing''.

Example 2 Phosphorus pentoxide was added to soft petroleum asphalt, which is a raw material for ordinary blown asphalt. O wt % was added to the sole and ordinary blown asphalt (needle hardness 25, softening point 90
A catalytic blown asphalt having a needle strength grade of 30/40 was produced using 500 g of a catalytic blown asphalt raw material prepared by mixing 10 wt and 30 w of 10 wt and 30 w of 10 wt.

The required reaction time and product properties in this case are shown in Table 2, and by mixing ordinary flow asphalt, the required reaction time could be significantly shortened without deteriorating the quality.

Furthermore, the present invention is most effective when the normal blown asphalt manufacturing equipment and the catalytic blown asphalt manufacturing equipment are placed side by side.

The figure is a flow sheet showing the embodiment as an example.

To explain the present invention in detail with reference to the drawings, soft petroleum asphalt 1 as a raw material is passed through a line 2, heated in a heating furnace 3, and fed into a reaction tower 4.

In the reaction tower 4, air is blown into the reactor from 5, and the blown reaction proceeds to produce ordinary blown asphalt.

A part of it is extracted from line 6, heated through heating furnace 3 together with raw material soft petroleum asphalt from line 2, and circulated to reaction tower 4, where it is stirred and maintained at a predetermined temperature.

The produced ordinary blown asphalt is taken out from the bottom of the reaction column 4, and a portion is taken out through line 8 as a product.

In addition, a portion passes through line 9 and becomes part of the raw material for catalyst blown asphalt.

If desired, the entire amount of normally blown asphalt can be fed in via line 9 as part of the feedstock for catalytic blown asphalt.

Spent air from reaction tower 4 is discharged through line 7.

Similarly, soft petroleum asphalt 1 as a raw material is mixed with a catalyst (polyphosphoric acid or phosphorus pentoxide) added through line 11 through line 10, heated in a heating furnace 12, and then ordinary blown asphalt is fed through line 9. and is sent to the reaction tower 13.

In the reaction tower 13, air is blown into the reaction tower 14, and the blowing reaction proceeds to produce catalyst blown asphalt.

A part of the catalytic blown asphalt is taken out from line 15, heated through heating furnace 12 together with raw material soft petroleum asphalt from line 10, and circulated to reaction tower 13 where it is stirred and maintained at a predetermined temperature.

The produced catalyst blown asphalt is taken out from line 17 and becomes a product.

The spent air of the reaction tower 13 is discharged from the reactor 16.

The feature of the continuous process shown in the figure is that by varying the ratio of the raw material soft petroleum asphalt fed through line 10 and the amount of normal blown asphalt fed through line 9, normal blown asphalt and catalyst blown asphalt can be separated. The production volume can be efficiently and flexibly adjusted to a certain extent according to the demand volume, and the production volume of catalytic blown asphalt per unit time can be increased as detailed above.

An example performed using the illustrated process is shown below.

Example 3 During the parallel operation of the regular blown asphalt manufacturing equipment and the catalyst blown asphalt manufacturing equipment using the continuous process shown in the figure, a part of the regular blown asphalt product (needle hardness 25, softening point 90°C) was supplied as regular blown asphalt. A constant amount is continuously supplied to the heating furnace outlet line of the catalytic blown asphalt manufacturing equipment through the line, under the normal operating conditions for catalytic blown asphalt manufacturing, i.e. reaction temperature 270°C, air amount 120 m/hr r/t.
On, the catalytic blown asphalt production equipment was operated continuously without changing the 1.0 wt% polyphosphoric acid.

As a result, as shown in Table 3, the required reaction time was shortened, and as a result, the production capacity of catalyst blown asphalt was increased by about 27 times.

Moreover, the quality of the obtained product was excellent as in the case of the comparative example.

[Brief explanation of the drawing]

The figure is a flow sheet showing an example of an embodiment of the present invention using a continuous process. Only the parts necessary for the present invention are shown and accessories are omitted. 1... Raw material soft petroleum asphalt, 2,10.
... Raw material supply line, 3, 12 ... Heating furnace, 4, 13 ... Reaction tower, 5, 14 ...
・Air blowing line, 6,15...Circulation line,
7.16・River・・Spent air discharge line, 8・・・・・
・Ordinary blown asphalt extraction line, 9...
...Ordinary blown asphalt supply line, 11...
...Catalyst supply line, 17...Catalyst blown asphalt extraction line.

Claims (1)

[Scope of Claims] 1. A method for producing catalytic blown asphalt, which comprises mixing 10 to 50 wt% of ordinary blown asphalt to a raw material for catalytic blown asphalt in producing blown asphalt using polyphosphoric acid or phosphorus pentoxide as a catalyst. 2 By arranging a continuous type ordinary blown asphalt production equipment and a continuous type catalytic blown asphalt production equipment and using both equipment in combination, a part or all of the ordinary blown asphalt produced by the ordinary blown asphalt production equipment can be used as is. The method for producing catalytic blown asphalt according to claim 1, wherein the method is carried out by continuously supplying the raw material asphalt of a catalytic blown asphalt production device as a source of a mixing material.