Chem Process Systems Ahmedabad, Gujarat

Vacuum Crystallizers are used for cases requiring very low operating temperatures achieved only by very high vacuum, and for those applications involving relatively small amounts of material, or when the material being processed must be handled on less than a continuous basis, it is often both convenient and economical.the batch vacuum crystallizer steam economy is achieved by multiple stage continuous equipment of five or more stages.

Oslo Type of Crystallizer is the oldest design developed for the production of large, coarse crystals. The design is based on desupersaturation of the mother liquor through contact with the largest crystals present in the crystallization chamber and keeping most of the crystals in suspension without contact by a stirring device, thus enabling the production of large crystals of narrow size distribution.

How it works

A bed of crystals is suspended in the vessel by the upward flow of supersaturated liquor in the annular region surrounding a central down-comer. Originally designed as classifying crystallizers, Oslo units are frequently operated in a mixed-suspension mode to improve productivity, although this reduces product crystal size. With the classifying mode of operation, hot concentrated feed solution is fed into the vessel at a point directly above the inlet to the circulation pipe. Saturated solution from the upper regions of the crystallizer, together with the small amount of feedstock, is circulated through the tubes of the heat exchanger and cooled by forced circulation of water or brine. In this way, the solution becomes supersaturated, although care must be taken to avoid spontaneous nucleation. Product crystal magma is removed from the lower regions of the vessel.

Key Advantages

• Operating costs are much lower than that of any other type of crystallizer
• Low maintenance
• Allows long production cycles between washing periods

Our Adiabatic Vacuum Continuous Crystallizers operate on the principle of adiabatic boiling wherein the feed liquor is exposed to high vacuum resulting in evaporation and cooling of the liquor.

The concentrated liquor is fed to the continuous crystallizer in an acidic or alkaline condition. At the point of super saturation, the salt present in the liquor starts crystallizing and the vapours generated are compressed with the help of steam jet boosters. The continuous crystallizer operating with multi-nozzle boosters offer the most optimized operational costs.

Batch Vacuum Crystallizers
Our Adiabatic Batch Vacuum Crystallizers are used for cases requiring very low operating temperatures achieved only by very high vacuum, and for those applications involving relatively small amounts of material, or when the material being processed must be handled on less than a continuous basis, it is often both convenient and economical.

Where the material is cooled through a very wide range and/or to a final temperature which requires very high vacuum, a large ejector or booster is utilized to compress the vapor to a pressure high enough for condensation with available cooling water. In such cases, the batch vacuum crystallizer steam economy is achieved by multiple stage continuous equipment of five or more stages.

Key Advantages

• Easy Heat Transfer
• Continuous Operation with Minimal Supervisory Requirement
• Uniform Product Quality
• Elastomer Lined Chambers withstand corrosion and can handle mother liquor in acidic conditions
• No Moving Parts
• The system eliminates the need of refrigeration plant, therefore, maintenance problems and down time periods associated with conventional chilling units are totally eliminated
• Total Reliability in Operations
• Requires Less Manpower