* To reinvest 1.25 bln eur in elevator unit
* Funds to be used to cut debt, pension liabilities
* Jobs, sites to be secure until 2027
* Price tag "impressive" -Jefferies
* Thyssenkrupp shares close up 4.8% in Frankfurt (Adds Cinven comment, bullet points)
By Christoph Steitz, Edward Taylor, Matthias Inverardi and Tom Käckenhoff
FRANKFURT/DUESSELDORF, Feb 28 (Reuters) - Thyssenkrupp AG said on Thursday it agreed to sell its elevators division to a consortium of Advent, Cinven and Germany's RAG foundation for 17.2 billion euros ($18.7 billion) in what could be the world's largest buyout this year.
The bidding group prevailed against a rival consortium comprising Blackstone Group Inc, Carlyle Group Inc and the Canada Pension Plan Investment Board, which sources said submitted a lower offer.
The deal, Europe's biggest buyout since 2007, values the division at roughly 18 times core earnings, a person familiar with the matter said. It is expected to close at the end of the second quarter.
The price beats the most optimistic estimates and roughly matches a bid that had been submitted earlier in the process by Finnish rival Kone, which dropped out of the race earlier this month over expected antitrust risks.
Thyssenkrupp said it would reinvest about 1.25 billion euros to take a stake in the unit, which, based on the purchase price, would result in a 7.3% share that would be used to partially fund its pension liabilities in a trust.
"With the sale, we are paving the way for Thyssenkrupp to become successful. Not only have we obtained a very good selling price, we will also be able to complete the transaction quickly," Thyssenkrupp Chief Executive Martina Merz said in a statement.
"It is now crucial for us to find the best possible balance for the use of the funds."
The decision followed a meeting of Thyssenkrupp's management and supervisory boards, ending the closely watched saga. The group said it is aiming for an investment grade rating following the deal, while it is currently rated junk by credit agencies.
Frankfurt-listed shares in the group closed 4.8% higher, with Jefferies analysts saying the price tag is impressive and should lead to a positive market reaction on Friday.
By far the German conglomerate's most profitable business, Thyssenkrupp Elevator is the world's fourth-largest lift manufacturer behind United Technologies Corp's Otis, Switzerland's Schindler and Kone.
(For an interactive version of the graphic click here tmsnrt.rs/2ZlfocO?eikon=true)
"Thyssenkrupp Elevator has established itself as a leading international group with a strong and cutting-edge product portfolio," said Ranjan Sen, managing partner and head of Germany at Advent.
Bruno Schick, partner and head of Germany, Austria, Switzerland and emerging Europe at Cinven, said the private equity owners intended to invest in the business to drive growth "both organically and via acquisition."
The auction leaves Thyssenkrupp with a much-needed cash injection at a time when the once mighty group has accumulated roughly 16 billion euros in debt and pension liabilities, more than twice its current market value.
Pummelled by ill-fated investments, a downturn in the car market, multiple leadership changes and an overly complex group structure that was tackled too late, Thyssenkrupp's shares trade around 13-year lows.
"The board now has the task to quickly use the proceeds in a targeted way to make sure the company can develop successfully," said the Alfried Krupp von Bohlen und Halbach Foundation, Thyssenkrupp's largest shareholder.
"Thyssenkrupp must become competitive again and also regain its strength to pay dividends."
As part of the deal, Thyssenkrupp Elevator will remain based in Germany and equal representation between shareholders and labour representatives will be safeguarded. Jobs and sites will be secure until at least March 31, 2027, union IG Metall said.
Thyssenkrupp will use the funds to cut debt, which will result in a significantly lower annual cash outflow for interest and pension payments, compensating for the loss of cash flow from the elevator business.
Funds will also be used to support Thyssenkrupp's other struggling divisions, including steel, plant building and car parts. The group will unveil exact plans for distribution in May.
"Each of the businesses has the potential for a fast and fundamental improvement," said Lars Foerberg, co-founder of Cevian Capital, Thyssenkrupp's second-largest shareholder.
"Now there needs to be full focus on making them operationally strong and fit for the future." ($1 = 0.9201 euro)
Additional reporting by Arno Schuetze in Frankfurt Editing by Daniel Wallis and Matthew Lewis