Evaporation & Crystallization

for Chemical Processing

Evaporation & Crystallization for the Chemical Processing Industry

In the chemical processing industry (CPI), HPD® Evaporators and Crystallizers are critical to various production processes including inorganic products, organic acids and agricultural products.

Waste minimization and valuable raw material recovery from CPI processes are accomplished through efficient, highly integrated Veolia systems worldwide.


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Industry Experience in Chemical Processing

Veolia Water Technologies has developed and successfully installed systems for more 50 chemical compounds. These compounds are the key components for several specific markets in the chemical processing industry.

Fully-integrated evaporation and crystallization systems from Veolia are often at the heart of crucial processes for the customers we serve. These systems perform many key functions in the creation of crystalline chemical products from many industries utilizing our technology:

  • Produce pure products from natural deposits
  • Recover by-products from waste streams
  • Concentration of dilute process streams
  • Volume reduction and recovery of valuable water resources
  • Recovery of process chemicals to reduction of makeup costs

Expertise in Specialty Chemical Production

HPD® Evaporation and Crystallization systems also used to produce specialty chemicals. Herbicides, amino acids, synthetic sweeteners, bisphenol-A, metabisulfate and thiocyanate are examples of end products produced using Veolia's evaporation and crystallization technologies.


Industry-specific Chemical Processing Pages

Alkim Alkali Kimya A.S

The Client's Needs

Alkim Alkali Kimya A.S. is one of the largest chemical producers in the region and produces chemicals such as various grades of sodium chloride, magnesium compounds including Leonite.  However, natural sodium sulfate is the largest single product offered by Alkim Alkali Chemicals. It was the original product that began the company in the early 1960's.


Project Description

Deciding to expand it's capacity in sodium sulfate production up to 330,000 tons annually, Alkim put plans forward to develop Glauberite deposits in Çayırhan. The company, after lengthy research, developed a unique extraction method of underground deposits using proprietary solution mining techniques.

Once mined, the Glauberite could be converted to anhydrous sodium sulfate as the end product. Alkim selected Veolia Water Technologies to design and supply the system to process the deposits into purified sodium sulfate. Veolia's HPD® crystallization technology has a proven history of successful installations that provide both purification of natural deposits as well as by-product recovery of high-quality sodium sulfate.


Process & System Description

Anhydrous Crystallization System

The facility at Çayırhan, near Ankara, is designed to produce 120,000 tpa (tons per annum) of refined sodium sulfate. The process begins with solution-mined Glauberite from natural deposits that are converted to Glauber's Salt as the first purification step. This is accomplished in a four-effect, HPD® forced circulation crystallization system, also provided by Veolia.

The Glauber's Salt is then transferred to a melter, which produces a slurry as feed to the crystallization system. This slurry is then re-crystallized and sent to the solids handling system as the final step.

The end product is anhydrous sodium sulfate that meets stringent quality requirements for both purity and crystal size to Alkim standards.

System Highlights:

  • Multiple-effect, MSMPR (mixed-suspension, mixed-product removal) crystallizer system
  • Efficient, four-body system utilizes facility steam for five-effect steam economy
  • Vapors from the crystallization system also drives the Glauber's Salt melter
  • Fully-automatic process controls integrated with balance of the plant


The Results

Despite difficult weather conditions during the execution phase of the project, plant startup began in December of 2011. The anhydrous sodium sulfate crystallization system is performing as specified by Alkim.