Iran Bitumen Emulsion , usually having a relatively low average particle size. That can be continuously and speedily prepared by a process comprising feeding emulsion components into the first of at least two static mixers, arranged in series.
We pass the product from the first mixer to the second mixer maintained at a temperature lower than that prevailing in the first mixer and below the boiling point of water.
The final emulsion product is obtained from the outlet of the second mixer.Bitumen emulsions of up to 70 wt. bitumen of mean particle size of from 2 to 8 microns are also described.
Description of Bitumen Emulsion
This invention relates to bitumen;emulsions and a process for preparing them.Bitumen emulsions we know them as materials useful in road-making and for other purposes. Their attractions are ease of handling, because of their lower viscosities than the starting bitumen, and their ability we apply at lower temperatures in spraying etc techniques. There are no environmental problems because in use. When the emulsion breaks and the water present evaporates to leave a film of bitumen where we require.
There are two main methods currently we use in the preparation of bitumen emulsions.
The first employs a colloid mill and the second a centrifugal pump.
In the process employing a colloid mill, bitumen, water and emulsifier are emulsified at a high shear rate. The process is continuous, but to obtain an emulsion in which the mean diameter particle size of the bitumen is at an acceptable level. Then for any pump that we give there is a limit on throughput in order that a sufficiently high shear rate we obtain that.
Furthermore, the process we conduct that at atmospheric pressure and in order for the emulsion product to emerge at a temperature of less than 100° C. then it we find that in practice that bitumen cannot be fed into the emulsifier at more than 140° C. Higher temperatures for the bitumen feed require lower temperatures for the water feed.
This causes skin-hardening of the bitumen on contact of the two feeds and emulsification becomes very difficult. This temperature factor places a limitation on the types of bitumen. Which we employ in bitumen emulsion manufacture by this route. A recent development, employing pressures slightly greater than atmospheric, involves cooling the product. So that it can emerge from the mixer at below 100° C. This entails extra equipment and is difficult to control.
The second method that we know employs a centrifugal pump. Which, in practice, normally we cannot operate under pressure. Again, this process has the drawbacks of the above-referred to colloid mill process. And furthermore, is essentially only a batch process.
The water phase has to be continually recycled whilst the hot bitumen is added little by little. The resultant emulsion product has a fairly wide particle size distribution. And this leads to unevenness in the surface obtainable in use of the product.