DD145545A1 - PROCESS FOR THE PREPARATION OF EXTRACTION WATER FOR THE EXTRACTION OF PLANT PRODUCTS - Google Patents

Abstract

The invention relates to a method for the preparation of Extraction water, in particular ammonia-containing condensate, for the extraction of herbal products, preferably from Sugar beet or cane. The aim of the invention is in the development of an economically favorable and without great Apparent expenditure feasible method for the removal of Ammonia from condensate without increasing the Not sucrose content. The object of the invention, · a Non-sucrose extraction water from ammoniacal tigers To gain condensate is achieved by the fact that the Heating and concentration of sucrose-containing intermediates accumulating condensate a change in Druckniveäus is subjected. ;

Description

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Title of the invention

Process for the treatment of extraction water for the extraction of vegetable products

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Field of application of the invention

The method is used for the treatment of extraction water, in particular ammonia-containing condensate, for the extraction of vegetable products, preferably sugar beet or sugar cane

Characteristic of the known technical solutions

The extraction of sucrose from sugar beet pulp or zer leinertem sugar cane is generally carried out by more or less heavily loaded with inorganic and organic substances tes hot water. This must comply with the procedural requirements in terms of pH and temperature. The water is therefore mixed with various inorganic acids, such as phosphoric acid, sulfuric acid or hydrochloric acid or with gaseous acid anhydrides, such as carbon dioxide or sulfur dioxide, to a pH of 5.6 to 5.8 and by heating to a temperature of 60 to 65 ⁰ C brought

The addition of acid increases the content of the process water to see-through sucrose substances, which change into the extract and thus reduce the quality of the intermediates and the sucrose yield.

It is known that the use of ammonia-containing condensate instead of service water is the non-sucrose concentration

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reduced in the extraction water, but to adjust the pH still requires the addition of inorganic acids or gaseous acid anhydrides, In addition, cation exchangers are used to remove the ammonia from the condensate »This eliminates the acidification of the extraction water, but the equipment and the wastewater extremely high, a result of the rise in in recent years nitrogen content of the beet of the ammonia content of the Kondenj-v has sats increased substantially "that leads · increased expenses: both for the addition of inorganic acids or _o gaseous acid anhydride as well as the distance of ammonia by ion exchanger »

Object of the invention

The aim of the invention is to develop an economically favorable and feasible without great expenditure on equipment process for the removal of ammonia from condensate without increasing the weight of sucrose content.

Explanation of the essence of the invention

The invention is based on the object to win a nichtaccharosearmes extraction water from ammoniakhaitigem condensate ο The ammonia content should be reduced so far that the consumption of inorganic acids or gaseous acid anhydrides for adjusting the pH of 5j6 to 5.8 substantially reduced or _{o o} According to the invention the object is achieved in that the resulting during heating and concentration of sucrose-containing intermediates from the heating vapor condensate is subjected to a change in pressure levelo This is done either by reducing pressure or by reducing pressure and heat or heat alone to reach the Saturation vapor pressure With the steam bubble formation occurring, the dissolved ammonia is largely expelled. By removing the heat of vaporization when the pressure is lowered, the condensate _β is simultaneously cooled

The ^aer in the heating chambers heat exchangers, evaporators and insurance

Condensation crystallizers formed with an ammonia content of 50 to 500 mg / l and a temperature of 70 to 95 ° C is collected and introduced according to the selected pressure level either with pump or by the external air pressure in the reactor The condensate is cascaded -, nozzle, Füllkörper- or Siebeinbauten uniformly over the reactor cross-section 'distributed' The reactor volume must ensure a Static.Staufhaltszeit the condensate of 2 to 10 min. The reactor pressure is between 0.20 and 1.20 kp / cm ² absolute according to the selected pressure level.

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The condensate entering the reactor begins to boil as soon as the saturation vapor pressure is reached or undershot. · This is the case when the pressure drops immediately after entering the reactor. When the pressure is increased, heating only takes place after heating with steam. Ο Boiling continues until the condensate temperature has reached the boiling point corresponding to the selected pressure level

nen water, that dropped to values from 60 to 105 ⁰ C · "With decreasing pressure and simultaneous heating boiling the condensate in the bottom of the reactor and after reaching this temperature, the .solange Verdampfungswäriae required is supplied. The vapor bubbles generated drive the ammonia up to a content of 0.bis 50 mg / 1 from the condensate from D _e r vapor and formed for the stripped ammonia from the reactor discharged If the selected pressure level under the external air pressure, the steam is in Both measures ensure the maintenance of the reactor pressure If the selected pressure level is above the external air pressure, vapor and gaseous ammonia are discharged through a throttle organ into the atmosphere, largely free from ammonia Condensate collects at the bottom of the reactor. Its derivation takes place under consideration of the selected pressure level. If the reactor pressure is above the external air pressure, conventional steam traps must be used in conjunction with a throttle body. Does the

2 reactor with a pressure less than 1 kp / cm absolute, the condensate discharge via a difference between the reactor pressure and the external air pressure equilibrium-holding liquid column (barometric column)

 Due to the constant supply of hot condensate and the discharge

of steam, ammonia and treated condensate of the described process runs continuously »The condensate flow rate is adjusted by throttle bodies in the condensate supply line to the extraction water needs. In order to ensure that the reactor pressure is maintained, throttling devices in the connecting line to the condenser and compressor or in the heating steam line ensure that the treated condensate circulates through the intermediates of extraction water, extract, dilute juice, vapors and condensate.

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embodiment

Condensate with an ammonia content of 250 mg / l and a temperature of 80 ⁰ C is introduced by the external air pressure as a result of lowering the .Druckniveaus to 0.25 kp / cm ² absolute in the reactor. Nozzles distribute it evenly across the cross-section of the reactor, which is designed for a residence time of 5 min

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The reactor pressure of 0.25 kp / cm ^ absolute corresponds to a boiling point.

temperature pure water of 65 ⁰ G "D _a s at 80 ⁰ C entering the reactor condensate therefore begins to boil immediately. The forming vapor bubbles drive the ammonia up to a content of about 50 mg / 1 from the condensate "D _a s boiling continues until the condensate temperature has dropped to about 65 C · The vapor formed is condensed in a spray condenser. sucked the gaseous ammonia through a water ring compressor. The cooled and largely freed from ammonia condensate is passed by means of a barometric column from the reactor into a collecting container. Between the lower edge of the Re.aktors and the upper edge of the liquid level · in the collecting container is a 'distance of 8 m required to adapt the condensate flow rate The Bxtraktionswasserbedarf and to comply with the reactor pressure are used throttle bodies in the connecting line to the mixing condenser and in the Kondensatzuführungsleitungo The process described goes through the constant supply hot condensate and the discharge of steam, ammonia and recycled condensate-continuously.

Claims (3)

invention claim 1. A process for the preparation of extraction water for the extraction of vegetable products, in particular of sugar beet pulp , characterized in that ammonia-containing condensate having a content of 50 to 500 mg'HEU / 1 ¹ ^ a temperature of 70 to 95 ⁰ C in a reactor of a change the pressure level is reduced by lowering the pressure, or by lowering the pressure and heat or by heat alone until saturation vapor pressure is reached and brought to a boil. 2. The method according to item 1, characterized in that the ammonia dissolved in the condensate expelled to a content of 0 to 50 mg HEU / 1 from the boiling condensate and removed together with the water vapor formed. 3. The method according to item 1 and 2, characterized in that the boiling required for boiling under reduced pressure swärme preferably removed from the condensate itself and so to cool it to about 65 ⁰ C is used.